Engines & Engine Parts

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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...

Showing All Items, Including Not in Stock Items That Match "1203"

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Results 1 - 25 of 113

Summit Racing™ Pro SBC 4-7 Swap Camshafts SUM-1203

Summit Racing™ Pro SBC 4-7 Swap Camshafts SUM-1203

Pro SBC Stage 4 Hyd. Flat-Tappet 4/7 Firing Order Swap Cam, 228/236 Dur., 108 LSA + 2 Adv, .473/.495 1.5 Ratio, .505/.528 1.6 Ratio, 2000-6200 Range

Part Number: SUM-1203

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

Summit Racing™ Pro SBC 4-7 Swap Cam and lifter kits SUM-K1203

Cam and Lifter kit, Pro SBC Stage 4 Hyd. Flat-Tappet 4/7 Firing Order Swap, 228/236 Dur., 108 LSA + 2 Adv, .473/.495 1.5 Ratio, 2000-6200 Range

Part Number: SUM-K1203

1.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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AFR 220cc SBC Eliminator Racing Heads 1203

Cylinder Heads, AFR 200cc SBC Eliminator Racing Heads, Assembled, Cast Aluminum, Solid Roller Camshaft, Chevy, Sold as a Pair

Part Number: AFR-1203

Not Yet Reviewed

Estimated Ship Date: Jun 4, 2026 if ordered today

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Estimated Ship Date: Jun 4, 2026 if ordered today

PAC Racing 300 Series Valve Spring Retainers PAC-R334

Dual Spring 300 Series Retainer - Retainer for PAC-1202 & 1203 Valve Springs. Lock angle: 7 degree

Part Number: RSC-PAC-R334

Not Yet Reviewed

Estimated Ship Date: Jun 2, 2026 if ordered today

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Estimated Ship Date: Jun 2, 2026 if ordered today

GMB Timing Belt Idler Pulleys 460-9740

TIMING BELT IDLER Replacement SAAB-9-2X(2005); SUBARU-BAJA, FORESTER, IMPREZA, LEGACY, OUTBACK (12-03)

Part Number: GMB-460-9740

Not Yet Reviewed

Estimated Ship Date: May 6, 2026 if ordered today

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Estimated Ship Date: May 6, 2026 if ordered today

PAC Racing 300 Series Valve Spring Retainers PAC-R334-16

Dual Spring 300 Series Retainer - Retainer for PAC-1202 & 1203 Valve Springs. Lock angle: 7 degree

Part Number: RSC-PAC-R334-16

Not Yet Reviewed

Estimated Ship Date: Jun 1, 2026 if ordered today

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Estimated Ship Date: Jun 1, 2026 if ordered today

S&S Cycle Piston Cooling Jets 310-1203

S&S Cycle M-Series Piston Cooling Jet Kit

Part Number: SSY-310-1203

Not Yet Reviewed

Estimated Ship Date: Apr 13, 2026 if ordered today

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Estimated Ship Date: Apr 13, 2026 if ordered today

Brodix Cylinder Heads Cylinder Heads 2121001

PB 1203 PKG

Part Number: BRO-2121001

Not Yet Reviewed

Estimated Ship Date: May 15, 2026 if ordered today

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Estimated Ship Date: May 15, 2026 if ordered today

PAC Racing 1200 Series Circle Track Valve Springs PAC-1203-16

Valve Springs, 1200 Series Circle Track, Dual, 1.260 in. Outside Diameter, 610 lb/in, 0.624 in. Inside Diameter, Set of 16

Part Number: RSC-PAC-1203-16

Not Yet Reviewed

Estimated Ship Date: May 7, 2026 if ordered today

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Estimated Ship Date: May 7, 2026 if ordered today

PAC Racing 1200 Series Circle Track Valve Springs PAC-1203

Valve Spring, 1200 Series Circle Track, Dual, 1.260 in. Outside Diameter, 610 lb/in, 0.624 in. Inside Diameter, Each

Part Number: RSC-PAC-1203

Not Yet Reviewed

Estimated Ship Date: Jun 1, 2026 if ordered today

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Estimated Ship Date: Jun 1, 2026 if ordered today

MAHLE Original Piston Rings 301-1203

RING SET, PLAIN

Part Number: MAH-3011203

Not Yet Reviewed

Estimated Ship Date: May 5, 2026 if ordered today

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Estimated Ship Date: May 5, 2026 if ordered today

MAHLE Original Piston Rings 302-1203

RING SET, PLAIN

Part Number: MAH-3021203

Not Yet Reviewed

Estimated Ship Date: May 5, 2026 if ordered today

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Estimated Ship Date: May 5, 2026 if ordered today

ARP Timing Cover Bolt Kits 120-3202

Timing Cover Bolts, 8740 Chromoly, Black, Hex Head, Buick, 5.7L, Kit

Part Number: ARP-120-3202

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

PRW Rocker Arm Adjuster Screws 1203188-01

Rocker Arm Adjusting Screw

Part Number: PQX-1203188-01

4.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

PowerBond Street Performance Harmonic Balancers PB1203ST

Harmonic Balancer, Street Performance, Ford, Mercury, 302, Each

Part Number: PBB-PB1203ST

Not Yet Reviewed

Estimated Ship Date: Apr 20, 2026 if ordered today

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Estimated Ship Date: Apr 20, 2026 if ordered today

PRW LS Series Fulcrums 1203641

FULCRUM, GM LS Series (1) Each OEM Rocker Arm

Part Number: PQX-1203641

Not Yet Reviewed

Estimated Ship Date: Today

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Estimated Ship Date: Today

Howards Cams Retrofit Hydraulic Roller Camshafts 120325-10

Camshaft, Retrofit, Hydraulic Roller Tappet, Advertised Duration 282/288, Lift .589/.600, Chevy, Big Block

Part Number: HRS-120325-10

Not Yet Reviewed

Estimated Ship Date: Jun 1, 2026 if ordered today

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Estimated Ship Date: Jun 1, 2026 if ordered today

ARP High Performance Series Cylinder Head Bolt Kits 120-3601

Cylinder Head Fasteners, High Performance Series Cylinder Head Bolt Kits, Hex, Chromoly, Black Oxide, Washers, Buick, 5.7L, Kit

Part Number: ARP-120-3601

Not Yet Reviewed

Estimated Ship Date: Today

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Estimated Ship Date: Today

PowerBond Premium OEM Replacement Harmonic Balancers PB1203N

Harmonic Balancer, OEM Replacement, Ford, Mercury, 302, Each

Part Number: PBB-PB1203N

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Apr 20, 2026 if ordered today

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Estimated Ship Date: Apr 20, 2026 if ordered today

March Performance Crankshaft Pulleys 12031

Crankshaft Pulley, V-Belt, 2-Groove, Aluminum, Clear Coat, Buick, 400, 430, 455, Each

Part Number: MCH-12031

Not Yet Reviewed

Estimated Ship Date: May 18, 2026 if ordered today

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Estimated Ship Date: May 18, 2026 if ordered today

D.S.S. FX-Series Forged 4032 Alloy Pistons 1-2038-3875

+4cc Dome Top SBC 23 Degree Forged 4032

Part Number: DMS-1-2038-3875

Not Yet Reviewed

Estimated Ship Date: Apr 27, 2026 if ordered today

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Estimated Ship Date: Apr 27, 2026 if ordered today

March Performance Aluminum V-Belt Water Pump Pulleys 12032

Water Pump Pulley, V-belt, 2-groove, Billet Aluminum, Clear Powdercoated, 6.5 in. o.d., Buick, 455, Long, Each

Part Number: MCH-12032

5.0 out of 5 stars ( 1 )

Estimated Ship Date: May 18, 2026 if ordered today

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Estimated Ship Date: May 18, 2026 if ordered today

Howards Cams Retrofit Hydraulic Roller Camshafts 120326-10

Camshaft, Hydraulic Roller Tappet, Advertised Duration 282/288, Lift .589/.601, Chevy, Big Block, Each

Part Number: HRS-120326-10

Not Yet Reviewed

Estimated Ship Date: May 29, 2026 if ordered today

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Estimated Ship Date: May 29, 2026 if ordered today

PRW Rocker Arm Pedestals and Stands 1203515

Rocker Arm Pedestal

Part Number: PQX-1203515

Not Yet Reviewed

Estimated Ship Date: Today

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Estimated Ship Date: Today

PRW Rocker Arm Studs 1203750

ROCKER ARM STUDS 3/8", 1.75" stud height, Each

Part Number: PQX-1203750

Not Yet Reviewed

Estimated Ship Date: Jun 9, 2026 if ordered today

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Estimated Ship Date: Jun 9, 2026 if ordered today

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