Back to 4.8 Rebuild Kits

Custom rebuild catalogue

Choose the parts for your 4.8 LS rebuild kit.

Use this rebuild checklist to compare the parts commonly replaced during a 4.8L Gen III LS refresh or performance rebuild. Verify engine generation, machine-shop measurements, and final sizing before ordering pistons, rings, or bearings.

Replacement priority scale: 1/5 = usually reuse unless damaged or missing. 2/5 = inspect closely and replace only if worn. 3/5 = depends on mileage, measurements, and build goals. 4/5 = strongly recommended during a rebuild. 5/5 = should usually be replaced.

Rotating assembly

Pistons, pins, rings, and related parts

Parts that move with the crankshaft and pistons.

2/5 Rotating assembly

Connecting rod set for 4.8L LS

4.8L LS connecting rod set for matching the shorter-stroke 4.8 bottom end during a rebuild or rotating assembly refresh.

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3/5 Rotating assembly

2004-2009 4.8L/5.3L Gen IV hypereutectic piston kit

Replacement piston kit option for 2004-2009 Chevy LS 4.8L and 5.3L Vortec Gen IV engines. Verify bore size, engine code, and machine shop measurements before ordering.

Stock size
View oversize options
.020 over forged pistons
5/5 Rotating assembly

2M4978 stock bore moly piston ring set

Stock bore moly piston rings for 4.8L and 5.3L LS engines. Confirm bore size before ordering if the block has been machined.

Stock size
View oversize options
Oversize rings: verify bore size before ordering.

Bearings

Bearing surfaces and oil clearance parts

Bearing parts should match crank and block measurements before ordering.

5/5 Bearings

Main bearings

Standard-size SI-Series main crank bearing set for Gen III/IV 4.8L, 5.3L, 5.7L, 6.0L, and 6.2L LS engines. Verify crank journal sizing and oil clearance before ordering.

Stock size
View undersize options
Undersize bearings: verify crank journal measurements first.
5/5 Bearings

Rod bearings

Standard-size SI-Series LS rod bearings for stock replacement or performance refreshes. Verify crank journal sizing and oil clearance before ordering.

Stock size
View undersize options
.010 undersized rod bearings
5/5 Bearings

King rod and main bearing set for LS engines

King rod and main bearing set for LS engines including 4.8L, 5.3L, and 6.0L. Verify crank journal sizing and oil clearance before ordering.

Stock size
View undersize options
Undersize bearings: verify crank journal measurements first.
4/5 Bearings

LS cam bearing design options

LS cam bearings are chosen by block design, not displacement alone. 1st Design LS blocks are typically 1997-2003; 2nd Design LS blocks are commonly 2007 and newer, with certain 2003-2006 blocks requiring CH-23 or CHP-25 style bearings after measurement.

CHP-10T 1997-2003
View later-design option
CH-25 2007+ / CH-23 applications CHP-10T fits 1st Design blocks where positions 1 and 5 measure 2.3260"-2.3280". CH-25/CHP-25 style bearings fit larger 2.3460"-2.3480" bores. Verify the exact block before ordering.

Valvetrain

Valve motion and camshaft parts

Parts that control airflow through the cylinder heads.

3/5 Valvetrain

2.000" stock replacement LS intake valve set

Stock replacement LS intake and exhaust valve options. Verify valve diameter, cylinder head casting, and machine shop recommendations before ordering.

2.000" intake valves 1.550" exhaust valves
4/5 Valvetrain

PAC-1218 valve springs

PAC-1218 valve springs for common LS camshaft paths. Match spring specs to the camshaft before ordering.

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3/5 Valvetrain

Valve spring retainers

Valve spring retainers for refreshing or upgrading LS valvetrain hardware during spring or camshaft work.

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3/5 Valvetrain

Valve locks (keepers)

Valve locks, also called keepers, secure the valve spring retainer to the valve stem during valvetrain assembly.

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2/5 Valvetrain

Rocker arms with upgraded trunnions

LS rocker arms with upgraded trunnions improve valvetrain reliability. Choose the DIY trunnion kit if you want to reuse your stock LS rockers and install the trunnions yourself.

View upgraded rockers DIY trunnion upgrade kit
3/5 Valvetrain

Upgraded 7.400" Chromoly LS Pushrods

Stronger chromoly pushrods for LS builds where 7.400" is the correct measured length for the valvetrain setup. Always verify pushrod length before ordering.

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5/5 Valvetrain

LS lifter guide trays 12595365

Set of 4 lifter trays for 4.8, 5.3, 5.7, 6.0, and 6.2 LS engines. Replace worn trays to keep lifters located correctly.

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4/5 Valvetrain

Delphi LS7 lifter set with guide trays

Delphi LS7-style lifter set with guide trays for refreshing the lifter system during an LS rebuild or cam swap.

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4/5 Valvetrain

Camshaft thrust retainer plate kit

Replacement camshaft retainer plate kit for Gen III LS engines during camshaft or timing reassembly.

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Timing and front drive

Timing, front cover, and rotating front-drive parts

Parts involved in cam timing, front cover service, and accessory drive support.

5/5 Timing and front drive

3-bolt 24x LS single roller timing chain set

3-bolt 24x LS single roller timing chain set with adjustable crank sprocket and ARP 134-1003 cam bolt kit. Verify cam gear style, reluctor type, and engine setup before ordering.

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2/5 Timing and front drive

LS harmonic balancer kit with installation tool and crank bolt

Harmonic balancer kit for LS front-drive service. Includes the installation tool and crank bolt, so verify fitment before ordering and avoid buying duplicate crank hardware.

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5/5 Timing and front drive

Harmonic balancer crankshaft damper bolt

Replacement LS crank bolt for builders who already have a balancer and installation tool but still need fresh torque-to-yield crank hardware.

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1/5 Timing and front drive

LS front timing cover with crank gasket and bolts set

Front timing cover kit with crank gasket and bolts for LS front-cover service. Verify sensor and front cover style before ordering.

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5/5 Timing and front drive

LS front timing cover gasket kit

Separate front timing cover gasket option for builders who are reusing their existing front cover and only need fresh sealing parts.

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Covers and external parts

Covers, pans, manifolds, and bolt-on engine parts

External engine pieces commonly checked, replaced, or resealed during a rebuild.

1/5 Covers and external parts

LS rear main seal cover, gasket, and bolts

Rear main seal cover kit with gasket and bolts for 1997-2013 LS-based 4.8, 5.3, 5.7, 6.0, and 6.2 V8 engines.

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3/5 Covers and external parts

ARP 134-1202 chromoly header bolt kit

Chevrolet Gen III/LS Series header bolts for replacing worn, missing, or unreliable exhaust manifold/header hardware.

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2/5 Covers and external parts

Engine coolant thermostat water inlet assembly

Thermostat housing and water inlet assembly for LS cooling-system refresh work. Verify hose routing and engine accessory setup before ordering.

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5/5 Covers and external parts

NGK 4177 PK8 spark plugs

Replacement spark plug set for refreshing ignition parts during an LS rebuild, cam swap, or first start.

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Fuel and plugs

Fuel sealing and block plug parts

Small parts that are easy to miss when refreshing an engine.

4/5 Fuel and plugs

LS engine block coolant and oil plug kit

Coolant and oil plug kit for sealing block service openings during an LS rebuild.

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4/5 Fuel and plugs

MSD 32829 Super Conductor spark plug wire set

Red MSD Super Conductor plug wire set for refreshing ignition wiring during an LS rebuild or cam swap.

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3/5 Fuel and plugs

GM 12703627 crankshaft position sensor

GM Genuine Parts crankshaft position sensor for replacing a damaged or questionable sensor during an LS rebuild.

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Gaskets and seals

Complete gasket and seal coverage

Use one complete gasket and seal set instead of buying every small gasket separately. Individual gasket cards are only worth adding later when a specific upgraded gasket is meaningfully different.

5/5 Gaskets and seals

Complete gasket and seal set

Use this complete gasket and seal set for the main sealing parts instead of buying separate valve cover, cover, pan, and small gasket listings one by one.

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Fasteners and hardware

Fasteners and hardware

Critical engine fasteners that are commonly replaced or upgraded during final assembly.

5/5 Fasteners and hardware

ARP 134-3609 head bolt kit

ARP head bolt kit for LS cylinder head installation during final assembly.

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5/5 Fasteners and hardware

ARP 134-6006 rod bolt kit

ARP rod bolt kit for LS connecting rods. Verify rod style and bolt compatibility before ordering.

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4/5 Fasteners and hardware

ARP 2345608 stud kit

Premium ARP stud kit option for a higher-quality LS rebuild where upgraded bottom-end fasteners are part of the build plan.

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Oiling

Oil system refresh parts

Oiling parts that matter for bearing life and engine reliability.

3/5 Oiling

High Volume LS oil pump

High-volume LS oil pump option for refreshing the oiling system during an LS rebuild. Match oil pump choice to bearing clearances and engine use.

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Configured for 4.8L Gen III LS engines.

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