Rebuilding a Chevy 350 Small Block engine involves disassembling the V8, inspecting its internal components, measuring wear, replacing damaged parts, and reassembling the engine according to the correct machining and assembly specifications. The Chevrolet 350 Small Block, with a nominal displacement of 350 cubic inches (5.7 liters), has powered numerous Chevrolet cars, trucks, and performance vehicles. Its widespread use and established aftermarket support make it a popular choice for engine restoration, classic-car projects, and performance builds.
A successful Chevy 350 Small Block rebuild depends on three critical factors: accurate component inspection, correct parts selection, and precise assembly. Replacing piston rings, bearings, and gaskets alone does not guarantee a reliable engine. The cylinder bores, crankshaft journals, connecting rods, cylinder heads, and lubrication system must also be evaluated to determine whether they can be reused, require machining, or need replacement. These measurements establish the correct component sizes and clearances for the rebuilt engine.
The rebuilding process begins with diagnosing the engine’s condition and documenting its original configuration. It then progresses through disassembly, cleaning, machine-shop inspection, parts selection, assembly, and initial startup. Understanding each stage helps prevent common problems such as excessive oil consumption, low oil pressure, bearing damage, and premature engine wear. Whether the goal is restoring factory-style performance or building a modified V8, the rebuild must follow specifications appropriate to the engine’s year, components, and intended application.
How Do You Know When a Chevy 350 Small Block Needs a Rebuild?
A Chevy 350 Small Block may need a rebuild when internal engine wear causes excessive oil consumption, low compression, reduced oil pressure, persistent mechanical knocking, or a noticeable loss of performance. These symptoms indicate that components such as piston rings, cylinder walls, crankshaft bearings, or valve guides may no longer operate within their intended tolerances. However, no single symptom automatically confirms that the engine needs a complete rebuild. Proper diagnosis helps distinguish internal wear from problems involving the ignition system, fuel delivery, external oil leaks, or other serviceable components.
Excessive oil consumption and blue exhaust smoke are common warning signs of internal engine wear. When piston rings no longer seal effectively against the cylinder walls, engine oil can enter the combustion chamber and burn with the air-fuel mixture. Worn valve stem seals or valve guides can produce similar symptoms, particularly after startup or following extended engine braking. Before deciding to replace pistons and rings, inspect the engine for external leaks and evaluate the cylinder condition, because replacing rings without addressing excessive cylinder wear may not restore proper oil control.
Low compression, difficult starting, rough idle, and reduced power can also indicate that a Chevy 350 requires internal inspection. A compression test measures the pressure developed in each cylinder during cranking, while a leak-down test helps identify where compressed air escapes. Air escaping through the crankcase can indicate piston-ring or cylinder sealing problems; air escaping through the intake or exhaust can point toward leaking valves. Comparing results across all eight cylinders provides a clearer picture of engine condition than relying on a single reading. The correct interpretation depends on the engine’s specifications, test procedure, and operating condition.
Low oil pressure and persistent knocking require particular attention because they may indicate problems with the lubrication system or worn bearing surfaces. Excessive clearance between the crankshaft journals and bearings can reduce the engine’s ability to maintain the intended oil film, while insufficient oil supply can accelerate wear and cause serious damage. Nevertheless, a faulty oil pump, worn pump drive, incorrect oil viscosity, or defective pressure sensor can also produce low-pressure symptoms. Verify the actual oil pressure and investigate the cause before deciding whether the crankshaft and bearings need rebuilding.
The decision to rebuild a Chevy 350 Small Block should ultimately follow measured evidence rather than mileage or symptoms alone. If compression and leak-down results indicate acceptable cylinder sealing, oil pressure is within the applicable specification, and internal inspection reveals no significant damage, a complete rebuild may be unnecessary. If measurements reveal excessive bore wear, damaged crankshaft journals, severe bearing deterioration, or other major internal faults, a rebuild becomes a more appropriate solution. Recording these findings before disassembly also helps determine the required machining work and prevents unnecessary parts purchases.
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What Tools and Parts Do You Need for a Chevy 350 Rebuild?
A successful Chevy 350 Small Block rebuild requires accurate measuring instruments, engine assembly tools, cleaning equipment, and replacement components selected according to the engine’s measured condition. Basic hand tools are sufficient for removing many external components, but internal engine assembly demands greater precision. A torque wrench, micrometers, a dial bore gauge, and feeler gauges help verify critical dimensions and clearances. These measurements determine whether the original components can be reused, whether machining is necessary, and which replacement parts will fit correctly.
Measuring tools are particularly important because engine components must operate within specific dimensional tolerances. Outside micrometers measure crankshaft journal diameters, while a dial bore gauge measures cylinder bore diameter, taper, and out-of-round conditions when used correctly with a suitable reference measurement. Feeler gauges help check selected clearances, and a dial indicator can measure crankshaft endplay. Plastigage may provide a supplementary check of bearing clearance, but it does not replace accurate dimensional measurement when a machine shop or precision measuring tools are available. The applicable specifications must come from the correct engine documentation and component manufacturer.
Assembly tools help prevent damage to newly machined or replacement components. A piston ring compressor allows pistons to enter the cylinder bores without damaging the rings, while a ring expander helps install piston rings without excessive bending. An engine stand provides stable access during disassembly and assembly, and an engine hoist allows the complete engine to be removed and installed safely. A dedicated engine pre-lubrication tool is also valuable because it helps circulate oil through the lubrication system before the first startup. Keeping the work area clean and using lint-free materials is essential because machining debris and abrasive particles can damage freshly assembled bearings and cylinder walls.
The parts required for a Chevy 350 rebuild depend on the results of the inspection. A rebuild commonly includes a gasket and seal set, piston rings, main bearings, connecting-rod bearings, and other wear-related components identified during disassembly. The oil pump, timing chain and gears, pistons, camshaft, lifters, and valve-train components should be inspected and replaced when their condition or the chosen build specification requires it. Replacing every component automatically is not always necessary, but reusing a damaged or incorrectly sized component can compromise the entire rebuild.
Choosing a rebuild kit before measuring the engine can create avoidable compatibility problems. A Chevy 350 may have standard-size components or require machining that changes the cylinder bore or crankshaft journal dimensions. For example, an engine block bored to an oversize dimension needs compatible pistons and rings, while a crankshaft ground to an undersize journal requires matching bearings. The correct purchasing sequence is therefore to inspect and measure the engine first, confirm the machining plan, and then select parts that match the finished dimensions and intended application.
How Do You Disassemble a Chevy 350 Small Block Engine?
Disassembling a Chevy 350 Small Block requires a controlled sequence that protects reusable components, preserves the original assembly information, and makes internal wear easier to identify. Before removing the engine, disconnect the battery, drain the engine oil and coolant, relieve fuel-system pressure where applicable, and disconnect the electrical connections, fuel lines, exhaust connections, cooling hoses, and drivetrain attachments. Support the engine with appropriately rated lifting equipment and follow the vehicle manufacturer’s removal procedures. Photographing the original installation and labeling connectors, brackets, and fasteners helps prevent confusion during reassembly.
Once the engine is secured on an engine stand, remove the external accessories and intake system to expose the internal components. Depending on the build, this includes the alternator, power-steering accessories, water pump, distributor, carburetor or throttle-body components, intake manifold, exhaust manifolds, and valve covers. Remove the rocker arms, pushrods, and cylinder heads in a controlled manner. Keep pushrods, rocker components, and other parts organized by their original positions when their condition or design makes location important. This record is especially useful when diagnosing uneven wear or determining whether the previous assembly contained mismatched components.
The next stage involves removing the oil pan, oil pump, timing cover, timing set, and valve-train components required for the planned inspection. After exposing the rotating assembly, remove the connecting-rod caps and main-bearing caps according to the correct service procedure, keeping each cap associated with its original location and orientation. Extract the piston-and-connecting-rod assemblies carefully to avoid scratching the cylinder walls, then remove the crankshaft. Bearing shells should be retained and labeled for inspection because their wear patterns can reveal lubrication problems, misalignment, excessive clearance, or other operating conditions.
After disassembly, clean the components sufficiently for inspection and document visible damage before deciding what to replace. Look for scoring on cylinder walls, worn bearing surfaces, damaged piston ring lands, heat discoloration, cracks, and evidence of coolant or oil contamination. However, visual inspection alone cannot establish whether every component remains within specification. The cylinder bores, crankshaft journals, connecting rods, and other critical surfaces must be measured with suitable instruments, while suspected cracks or complex damage may require professional inspection. This information determines the machining work and replacement parts needed for the rebuild.
Maintaining an organized disassembly process reduces the risk of assembly errors and unnecessary expense. Mixing bearing caps, losing fasteners, damaging machined surfaces, or discarding worn components before examining their condition can remove useful diagnostic evidence. A careful record of the original configuration, component locations, visible defects, and preliminary measurements provides a reliable starting point for the next stage: inspecting and measuring the Chevy 350 engine components.
How Do You Inspect and Measure Chevy 350 Engine Components?
Inspecting and measuring a Chevy 350 Small Block determines which engine components can be reused, which require machining, and which must be replaced. After disassembly and cleaning, the engine block, crankshaft, pistons, connecting rods, camshaft, and cylinder heads must be evaluated against the specifications for the particular engine and replacement components. Visual inspection identifies obvious damage, but precision measurements are necessary to determine whether critical surfaces remain within acceptable limits. Skipping this stage can result in incorrect parts selection, poor oil control, excessive bearing wear, or premature engine failure.
The engine block requires careful examination of the cylinder bores, deck surfaces, main-bearing saddles, coolant passages, and threaded holes. A dial bore gauge, referenced against an appropriate measuring standard, can establish each cylinder’s diameter and reveal taper or out-of-round conditions. These measurements help determine whether the original bore remains suitable or requires machining. For example, a cylinder with excessive taper may prevent new piston rings from sealing consistently against the wall, even if the rings themselves are new. Suspected cracks, damaged main-bearing saddles, or severe corrosion may require specialized inspection before the block can be approved for reuse.
The crankshaft must be measured to determine the condition of its main and connecting-rod journals. Outside micrometers reveal journal diameter and help identify wear, taper, and out-of-round conditions. Inspect the journal surfaces for scoring, heat discoloration, and other damage that could compromise the bearing oil film. Crankshaft endplay and bearing clearances must also be checked during the appropriate assembly stages. If journal dimensions fall outside the applicable limits, a qualified machine shop must determine whether polishing, grinding, or replacement is appropriate. Bearings must then match the finished journal dimensions rather than being selected solely by engine model.
Pistons and connecting rods require equally careful inspection because their dimensions affect cylinder sealing, mechanical strength, and reciprocating motion. Examine piston skirts for scoring, piston ring lands for damage, and wrist-pin areas for excessive wear. Measure the piston and cylinder bore according to the component manufacturer’s specified locations and procedures to establish the correct piston-to-wall clearance. Connecting rods should be checked for damage, alignment, and big-end bore condition, with additional inspection where overheating or bearing failure is suspected. Piston ring end gap must be measured in the actual cylinder bore using the ring manufacturer’s procedure, because the correct gap depends on the ring design, bore size, and intended application.
Cylinder heads and valve-train components must also be checked before the rebuild proceeds. Inspect valve seats, valve stems, guides, springs, rocker arms, pushrods, and camshaft lobes for wear or damage. Check cylinder heads for cracks, warping, and sealing-surface defects; pressure testing or other machine-shop inspection may be necessary when damage is suspected. A worn valve guide, for instance, can contribute to oil consumption even when the piston rings and cylinder walls are in good condition. Measuring and inspecting these components helps identify the actual source of the problem instead of replacing parts without evidence.
The inspection results should determine the rebuild plan before replacement parts are ordered. A block with serviceable cylinder bores may not require the same machining as one with excessive wear, while a crankshaft with damaged journals may require a different bearing specification after machining. Record all relevant measurements and compare them with the correct Chevrolet service documentation, engine-specific references, and component manufacturers’ instructions. This measurement-based approach provides the foundation for selecting appropriate machine work and assembling a reliable Chevy 350 Small Block.
What Machine Work Does a Chevy 350 Small Block Need?
A Chevy 350 Small Block may require machine work to restore worn surfaces, correct dimensional problems, and prepare the engine block and internal components for reliable operation. The exact work depends on measurements taken during inspection rather than a fixed rebuilding checklist. Common operations include cylinder boring and honing, crankshaft grinding or polishing, cylinder-head resurfacing, valve-seat machining, and connecting-rod reconditioning. A machine shop should evaluate the measured condition of each component before recommending machining or replacement.
Cylinder boring and honing are important when the cylinder bores show excessive wear, taper, or out-of-round conditions. Boring removes material to establish the required diameter, while honing refines the surface finish and cylinder geometry for the selected piston rings. The finished bore must match the replacement pistons and the specified piston-to-wall clearance. For example, if machining increases the cylinder diameter beyond the original standard size, the rebuild requires compatible oversize pistons and piston rings. Honing alone cannot correct every cylinder that has excessive wear or significant geometric distortion.
Crankshaft machining addresses wear or damage on the main and connecting-rod journals. If the journals remain within the applicable specifications and have suitable surface finishes, polishing may be sufficient in some cases. More substantial wear may require grinding the journals to an approved undersize, provided the crankshaft can safely accommodate that machining. The bearings must match the final journal dimensions and the resulting clearances must be verified. A crankshaft with cracks, severe damage, or dimensions beyond acceptable limits may need replacement rather than further machining.
Cylinder heads may require resurfacing, valve-seat work, valve-guide repair, or crack inspection. These operations help restore the surfaces and sealing conditions needed for proper compression and combustion. Resurfacing should not be performed automatically because removing material changes the head’s dimensions and can affect compression ratio or intake-manifold alignment. The machine shop must evaluate head flatness, valve condition, sealing surfaces, and the manufacturer’s applicable limits before selecting the appropriate repair.
Connecting rods, the engine block’s main-bearing saddles, and other structural components may also need specialized inspection or reconditioning. Connecting-rod big ends must maintain the correct geometry, while the block’s main-bearing alignment must remain suitable for the crankshaft. If the block has damaged main-bearing saddles, cracks, or severe corrosion, more extensive repairs or replacement may be necessary. These conditions require professional assessment because incorrect machining can compromise bearing alignment and engine durability.
The most effective approach is to approve a machine-work plan only after the engine has been cleaned, measured, and evaluated. The machine shop should document the finished cylinder-bore dimensions, crankshaft journal sizes, and any other critical specifications needed to select the correct components. This process avoids paying for unnecessary machining while ensuring that worn parts are not reused simply to reduce costs. Once the machining plan is finalized, the rebuild can proceed with pistons, bearings, rings, and other components matched to the actual finished dimensions.
How Do You Choose the Right Parts for a Chevy 350 Rebuild?
Choosing the right parts for a Chevy 350 Small Block rebuild requires matching each component to the engine’s measured dimensions, intended performance, and operating conditions. The correct parts list cannot be finalized until the engine block, crankshaft, pistons, connecting rods, and cylinder heads have been inspected and any required machine work has been determined. Selecting a rebuild kit based only on the engine’s 350-cubic-inch displacement can lead to dimensional mismatches, incorrect clearances, and unnecessary replacement costs. The engine’s year, original configuration, existing modifications, and finished machining dimensions all influence parts compatibility.
Pistons and piston rings must match the finished cylinder bores and the engine’s intended compression ratio. If the block remains at its standard bore size, standard-size pistons may be appropriate when all measurements confirm that the original dimensions remain serviceable. If the cylinders require boring, the replacement pistons must match the resulting oversize dimensions, and the rings must be compatible with both the finished bore and the piston ring grooves. Piston design also affects compression ratio and compatibility with the cylinder heads. For example, replacing original pistons with a different crown design can change combustion-chamber volume and alter the engine’s compression characteristics.
Main bearings and connecting-rod bearings must match the final crankshaft journal dimensions and provide the specified oil clearances. A crankshaft that has been ground to an undersize requires matching undersize bearings; standard bearings are not appropriate simply because the engine is still a Chevy 350. Bearing selection should also account for the actual measured clearances and the applicable specifications. Incorrect clearance can interfere with the oil film between the journal and bearing, contributing to excessive wear, low oil pressure, or bearing damage. The oil pump, pickup, and related lubrication components should likewise be evaluated for compatibility with the oil pan, engine configuration, and intended use.
The camshaft and valve-train components should be selected as a compatible combination rather than as unrelated upgrades. Camshaft specifications influence valve timing, engine torque characteristics, idle quality, and the engine’s operating range. Valve springs, lifters, pushrods, rocker arms, and timing components must suit the selected camshaft and the cylinder-head configuration. A performance camshaft, for example, may require different valve springs and careful verification of spring travel, retainer clearance, and piston-to-valve clearance. A mismatch can cause mechanical interference or accelerated wear even when each component appears suitable individually.
Gaskets, seals, the timing set, the oil pump, and other supporting parts should be chosen according to the final engine configuration. Gasket dimensions must suit the block, cylinder heads, and selected components, while the oil pump must provide suitable lubrication for the intended application. A factory-style street rebuild prioritizes dependable operation, compatibility, and appropriate factory specifications. A modified engine may require different pistons, camshaft characteristics, valve-train components, or other supporting upgrades. In either case, the complete combination must work together rather than relying on individual parts advertised as performance upgrades.
Before ordering parts, create a final specification record that includes the finished cylinder-bore dimensions, piston sizes, crankshaft journal dimensions, bearing clearances, compression requirements, and the intended use of the engine. Confirm part numbers and compatibility with the relevant manufacturer documentation. This sequence reduces the risk of purchasing components that do not fit the machined engine and provides a reliable foundation for the assembly stage.
How Do You Assemble a Chevy 350 Small Block Correctly?
Assembling a Chevy 350 Small Block correctly requires clean components, verified clearances, accurate fastener torque, and a controlled installation sequence. Even newly machined parts can fail prematurely if the crankshaft, bearings, pistons, connecting rods, camshaft, or lubrication system are installed incorrectly. Before assembly begins, clean the block and its oil passages thoroughly, remove machining debris, and confirm that every component matches the final measurements and specifications. Keep the engine assembly area clean because abrasive particles left in oil passages or bearing surfaces can damage the engine shortly after startup.
The crankshaft and main bearings should be installed first, using the bearing sizes selected for the measured crankshaft journals. Apply the specified assembly lubricant to the appropriate bearing surfaces, tighten the main fasteners according to the documentation for the exact engine configuration, and verify crankshaft rotation and endplay. The crankshaft should rotate smoothly without binding. If it becomes difficult to turn after the main caps are tightened, stop and investigate the bearing clearances, cap positions, and alignment rather than forcing it to rotate. This early check helps identify assembly problems before the rotating assembly becomes more difficult to access.
Next, install the piston and connecting-rod assemblies using the correct piston orientation, bearing clearances, and piston-ring installation procedure. The cylinder walls should be prepared according to the ring manufacturer’s instructions, and ring gaps must be checked against the specifications for the selected rings and application. Use a suitable ring compressor to guide each piston into its cylinder without damaging the rings or bore. Once the connecting rods are secured, verify that the crankshaft continues to rotate smoothly. Any unexpected resistance should be investigated immediately because a reversed component, incorrect clearance, or installation error can create mechanical interference.
Install the camshaft and timing components according to the engine’s configuration and the camshaft manufacturer’s instructions. The timing marks must align correctly, and any required camshaft degreeing or additional clearance checks should be completed before proceeding. Install the cylinder heads with compatible head gaskets, then tighten the head fasteners in the specified sequence and stages. The required torque values and tightening procedures depend on the exact fasteners, lubrication conditions, and component instructions; there is no single universal torque specification that safely applies to every Chevy 350 rebuild. The valvetrain must also be adjusted according to the lifter type and the selected camshaft’s requirements.
The oil pump, pickup, oil pan, timing cover, intake manifold, and remaining accessories can then be installed after their fitment and sealing surfaces have been checked. Confirm that the oil-pump pickup is compatible with the oil pan and that the lubrication passages remain clear. Before closing the engine, verify critical measurements such as crankshaft endplay, bearing clearances, piston-ring gaps, and any required piston-to-valve clearance. Record the results rather than relying on visual judgment alone. A properly assembled Chevy 350 should meet the specifications for its actual components, rotate without abnormal resistance, and be ready for controlled lubrication-system priming and pre-start checks.
How Do You Prime and Break In a Rebuilt Chevy 350 Engine?
Priming the lubrication system and following the correct break-in procedure are essential steps before putting a rebuilt Chevy 350 Small Block into regular service. Priming circulates oil through the engine before the crankshaft and valvetrain begin operating under their own power. This reduces the risk of starting the engine with dry bearing surfaces and insufficient lubrication. Before the first start, fill the crankcase with the specified oil, verify the oil filter installation, and use an appropriate priming tool compatible with the engine’s oil-pump design. Follow the engine or priming-tool manufacturer’s procedure to circulate oil and confirm that lubrication reaches the required areas.
After priming, complete a systematic pre-start inspection. Confirm that the ignition timing is set appropriately for initial startup, the cooling system is filled, fuel connections are secure, and electrical connections are correctly installed. Check that the throttle operates freely and that no tools or loose objects remain near moving components. If the engine configuration allows it, verify oil circulation and pressure during priming using a suitable gauge. These checks help identify installation errors before combustion begins. If oil pressure does not develop as expected, do not proceed with startup until the cause has been identified.
The break-in procedure depends heavily on the camshaft and lifter type installed during the rebuild. A flat-tappet camshaft generally requires a specific initial run-in procedure to establish the necessary wear pattern between the cam lobes and lifters. This procedure may specify an elevated engine-speed range, a defined operating period, and a particular break-in oil or additive formulation. Follow the camshaft manufacturer’s instructions precisely because inadequate lubrication or incorrect initial operation can damage the camshaft and lifters. A roller-camshaft engine has different contact characteristics and may not require the same flat-tappet break-in routine, although it still requires proper lubrication and careful initial operation.
During the first operating period, monitor oil pressure, coolant temperature, unusual mechanical noise, exhaust behavior, and fluid leaks. Stop the engine if oil pressure falls outside the expected range, temperature rises abnormally, or a serious knocking or scraping sound develops. Do not assume that every leak or noise will disappear as the engine warms up. After the initial run, follow the engine builder’s recommendations for inspecting fasteners, checking fluid levels, changing the oil and filter, and reviewing any break-in findings. The exact inspection intervals depend on the components used and the engine builder’s procedure.
A successful break-in does not compensate for incorrect assembly, unsuitable clearances, or contaminated oil passages. It establishes the operating conditions needed for the rebuilt components to begin service under the manufacturer’s specified procedure. Keeping records of oil pressure, temperature, operating time, and any adjustments provides a useful baseline for identifying problems during the first miles of operation.
How Do You Prime and Break In a Rebuilt Chevy 350 Engine?
Priming the lubrication system and following the correct break-in procedure are essential steps before putting a rebuilt Chevy 350 Small Block into regular service. Priming circulates oil through the engine before the crankshaft and valvetrain begin operating under their own power. This reduces the risk of starting the engine with dry bearing surfaces and insufficient lubrication. Before the first start, fill the crankcase with the specified oil, verify the oil filter installation, and use an appropriate priming tool compatible with the engine’s oil-pump design. Follow the engine or priming-tool manufacturer’s procedure to circulate oil and confirm that lubrication reaches the required areas.
After priming, complete a systematic pre-start inspection. Confirm that the ignition timing is set appropriately for initial startup, the cooling system is filled, fuel connections are secure, and electrical connections are correctly installed. Check that the throttle operates freely and that no tools or loose objects remain near moving components. If the engine configuration allows it, verify oil circulation and pressure during priming using a suitable gauge. These checks help identify installation errors before combustion begins. If oil pressure does not develop as expected, do not proceed with startup until the cause has been identified.
The break-in procedure depends heavily on the camshaft and lifter type installed during the rebuild. A flat-tappet camshaft generally requires a specific initial run-in procedure to establish the necessary wear pattern between the cam lobes and lifters. This procedure may specify an elevated engine-speed range, a defined operating period, and a particular break-in oil or additive formulation. Follow the camshaft manufacturer’s instructions precisely because inadequate lubrication or incorrect initial operation can damage the camshaft and lifters. A roller-camshaft engine has different contact characteristics and may not require the same flat-tappet break-in routine, although it still requires proper lubrication and careful initial operation.
During the first operating period, monitor oil pressure, coolant temperature, unusual mechanical noise, exhaust behavior, and fluid leaks. Stop the engine if oil pressure falls outside the expected range, temperature rises abnormally, or a serious knocking or scraping sound develops. Do not assume that every leak or noise will disappear as the engine warms up. After the initial run, follow the engine builder’s recommendations for inspecting fasteners, checking fluid levels, changing the oil and filter, and reviewing any break-in findings. The exact inspection intervals depend on the components used and the engine builder’s procedure.
A successful break-in does not compensate for incorrect assembly, unsuitable clearances, or contaminated oil passages. It establishes the operating conditions needed for the rebuilt components to begin service under the manufacturer’s specified procedure. Keeping records of oil pressure, temperature, operating time, and any adjustments provides a useful baseline for identifying problems during the first miles of operation.