Engines & Engine Parts

Welcome to your headquarters for horsepower—the place to get everything you need to build real power and performance! We’ve got competition-proven crate engines, performance-matched...

Welcome to your headquarters for horsepower—the place to get everything you need to build real power and performance! We’ve got competition-proven crate engines, performance-matched top end kits, and complete rotating assemblies from the biggest names in the industry. You can add a set of high-flow cylinder heads to your powerplant, upgrade your valvetrain, improve your oiling system, or drop in a new set of pistons. We also have a complete selection of crankshafts, connecting rods, harmonic balancers, pulleys, and engine brackets. We even have everything you need to restore the horsepower that time has stolen from your...

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Dorman Rear Main Seal Covers 635-518

Rear Main Seal Cover, Aluminum, Natural, Buick, Cadillac, Chevy, GMC, Hummer, Pontiac, Saab, Kit

Part Number: RNB-635-518

3.89 out of 5 stars ( 9 )

Estimated Ship Date: Today

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Summit Racing™ LS Rear Main Seal Housings SUM-G2621

Housing, Rear Main Seal, Aluminum, Chevy, LS, Each

Part Number: SUM-G2621

2.35 out of 5 stars ( 17 )

Estimated Ship Date: Today

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Mopar Replacement Crankshaft Rear Oil Seal Retainers 53021335AE

Rear Seal Retainer, Chrysler, Dodge, Jeep, Ram, Each

Part Number: MOP-53021335AE

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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ARP Rear Motor Cover Fasteners 134-1503

ARP Rear Motor Cover Fasteners 134-1503

Rear Motor Cover Bolts, Hex Head, 8740 Chromoly, Black, Washers, Chevy, V8, LS, Kit

Part Number: ARP-134-1503

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Stef's Rear Main Seal Adapter Kits 7036

Rear Main Seal Adapter - Big Block Chevy

Part Number: STF-7036

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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ACDelco Rear Main Seal Housings 12595923

Rear Main Seal Housing, Engine Crankshaft Seal Housing, Rear Main Seal, V6, One-Piece, Each

Part Number: ADO-12595923

Not Yet Reviewed

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ARP Rear Motor Cover Fasteners 134-1504

Rear Motor Cover Bolts, 12-point Head, 8740 Chromoly, Black, Washers, Chevy, V8, LS, Kit

Part Number: ARP-134-1504

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Today

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Allstar Performance Small Block Rear Main Seal Adapters ALL26126

Seal Adapter, Billet Aluminum, 1 to 2-Piece Style, Chevy, Small Block Gen I, Kit

Part Number: AAF-ALL26126

4.5 out of 5 stars ( 4 )

Estimated Ship Date: Today

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Chevrolet Performance Rear Main Seal Retainers 12554312

Rear Main Seal Housing, Chevy, Small Block, LT1, Each

Part Number: NAL-12554312

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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ICT Billet Rear Main Cover Housings 551727

Rear Main Seal Housing, Billet Aluminum, Natural, Chevy, Small Block LS, Each

Part Number: ICB-551727

Not Yet Reviewed

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ARP Rear Motor Cover Fasteners 434-1504

Rear Motor Cover Bolts, 12-point Head, Stainless Steel, Polished, Washers, Chevy, 4.8L, 5.3L, 6.0L, Kit

Part Number: ARP-434-1504

Not Yet Reviewed

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ARP Rear Motor Cover Fasteners 434-1503

Rear Motor Cover Bolts, Hex Head, Stainless Steel, Polished, Washers, Chevy, 4.8L, 5.3L, 6.0L, Kit

Part Number: ARP-434-1503

Not Yet Reviewed

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Dorman Rear Main Seal Covers 635-118

Rear Main Seal Cover, Aluminum, Natural, Ford, 6.0L Diesel, 6.4L Diesel, Kit

Part Number: RNB-635-118

1.0 out of 5 stars ( 1 )

Estimated Ship Date: Feb 11, 2026 if ordered today

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Estimated Ship Date: Feb 11, 2026 if ordered today

Summit Racing™ Rear Main Seal Housings SUM-01-8571

Housing, Rear Main Seal, Billet Aluminum, Rear Main Included, Gasket,Clear Andoized, Chevy, LS, Each

Part Number: SUM-01-8571

Not Yet Reviewed

Estimated Ship Date: Today

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Allstar Performance Small Block Rear Main Seal Adapters ALL26125

Seal Adapter, Billet Aluminum, 1 to 2-Piece Style, Chevy, Small Block Gen I, Kit

Part Number: AAF-ALL26125

4.5 out of 5 stars ( 4 )

Estimated Ship Date: Today

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Stef's Rear Main Seal Adapter Kits 7035

Seal Adapter, Billet Aluminum, 1 to 2-Piece, Chevy, 7.4L, Each

Part Number: STF-7035

3.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Moroso Rear Main Seal Adapter Kits 38315

Seal Adapter, Billet Aluminum, 1 to 2-Piece Style, Chevy, Small Block Gen I, Each

Part Number: MOR-38315

5.0 out of 5 stars ( 6 )

Estimated Ship Date: Today

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Engine Works Small Block Rear Main Seal Adapters 350LRMSA

Seal Adapter, Billet Aluminum, 1 to 2-Piece Style, Chevy, Small Block Gen I, Kit

Part Number: EW1-350LRMSA

Not Yet Reviewed

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Canton Racing SBC Rear Main Seal Adapters 21-850

Seal Adapter, Billet Aluminum, 1 to 2-Piece Style, Chevy, Small Block Gen I, Kit

Part Number: CTR-21-850

Not Yet Reviewed

Estimated Ship Date: Feb 10, 2026 if ordered today

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Estimated Ship Date: Feb 10, 2026 if ordered today

Engine Works Small Block Rear Main Seal Adapters 350ERMSA

Seal Adapter, Billet Aluminum, 1 to 2-Piece Style, Chevy, Small Block Gen I, Kit

Part Number: EW1-350ERMSA

Not Yet Reviewed

Estimated Ship Date: Today

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Ford Performance Parts Cam Cover Ball Stud Kits for 2011-2017 F-150, MUSTANG - M-6067B-F150

Rear Motor Cover Fastener, Hex Head/Ball Stud, Steel, Black, Set of 6

Part Number: FMS-M-6067B-F150

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Today

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ICT Billet Main Seal Adapter Bolts 551435

LS Rear Main Seal Adapter Bolts LS1, LS3, LS2, LSX, Set of 12

Part Number: ICB-551435

Not Yet Reviewed

Estimated Ship Date: Today

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Dorman Rear Main Seal Housings 635-786

Rear Main Seal Cover Kit

Part Number: RNB-635-786

Not Yet Reviewed

Estimated Ship Date: Feb 11, 2026 if ordered today

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Estimated Ship Date: Feb 11, 2026 if ordered today

Dorman Rear Main Seal Housings 635-557

Rear Seal

Part Number: RNB-635-557

Not Yet Reviewed

Estimated Ship Date: Feb 12, 2026 if ordered today

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Estimated Ship Date: Feb 12, 2026 if ordered today

Moroso Rear Motor Cover Fasteners 38805

BOLT KIT, REAR SEAL COVER, 12 BOLTS, GM LS

Part Number: MOR-38805

Not Yet Reviewed

Estimated Ship Date: Feb 16, 2026 if ordered today

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Estimated Ship Date: Feb 16, 2026 if ordered today

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