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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...

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 daily driver.

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Results 1 - 25 of 894

Harland Sharp Polylocks Rocker Arm Nuts PL038K

Made in the USA

Harland Sharp Polylocks Rocker Arm Nuts PL038K

Harland Sharp Polylocks Rocker Arm Nuts PL038K

Polylocks, 3/8 in. Thread, .550 in. Diameter, Set of 4

Part Number: CSP-PL038K

4.75 out of 5 stars ( 4 )

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Filter my search results to see Summit Racing brand parts.

Summit Racing™ SBC Cast Steel Roller Tip Rocker Arms SUM-141706PL

Summit Racing™ SBC Cast Steel Roller Tip Rocker Arms SUM-141706PL

Rocker Arms, Roller Tip, Cast Steel, 3/8 in. Stud Mount, 1.5 Ratio, Polylocks, Chevy, Small Block, Set of 16

Part Number: SUM-141706PL

4.47 out of 5 stars ( 51 )

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Harland Sharp Polylocks Rocker Arm Nuts PL716K

Made in the USA

Harland Sharp Polylocks Rocker Arm Nuts PL716K

Harland Sharp Polylocks Rocker Arm Nuts PL716K

Rocker Arm Nuts, Polylocks, Roller Rocker Arms, 7/16 in.-20 Thread, Set of 4

Part Number: CSP-PL716K

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Harland Sharp Polylocks Rocker Arm Nuts PL3761K

Made in the USA

Harland Sharp Polylocks Rocker Arm Nuts PL3761K

Harland Sharp Polylocks Rocker Arm Nuts PL3761K

Rocker Arm Nuts, Polylock Style, Full Roller, 7/16-20 in. Thread, 0.600 in. O.D., 2.200 in. Height, Set of 4

Part Number: CSP-PL3761K

Not Yet Reviewed

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Engine Works Polylocks 76-8

Engine Works Polylocks 76-8

Engine Works Polylocks 76-8

Rocker Arm Nuts, Stud Girdle Polylock, 12-Point, Non-Roller, 7/16 in.-20 Thread, 0.600 in. Slot Width, 2.10 in. Length, Set of 8

Part Number: EW1-76-8

Not Yet Reviewed

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Harland Sharp Polylocks Rocker Arm Nuts PL3800K

Made in the USA

Harland Sharp Polylocks Rocker Arm Nuts PL3800K

Harland Sharp Polylocks Rocker Arm Nuts PL3800K

Rocker Arm Polylocks, Stud Girdle, Fits 3/8 in. Stud, Set of 4

Part Number: CSP-PL3800K

Not Yet Reviewed

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Engine Works Polylocks 78-8

Engine Works Polylocks 78-8

Engine Works Polylocks 78-8

Rocker Arm Nuts, Stud Girdle Polylock, 12-Point, Non-Roller, 7/16 in.-20 Thread, 0.600 in. Slot Width, 2.60 in. Length, Set of 8

Part Number: EW1-78-8

Not Yet Reviewed

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Summit Racing™ BBC, Ford Modified V8, Cleveland, Big Block Cast Steel Roller Tip Rocker Arms SUM-141709PL

Summit Racing™ BBC, Ford Modified V8, Cleveland, Big Block Cast Steel Roller Tip Rocker Arms SUM-141709PL

Summit Racing™ BBC, Ford Modified V8, Cleveland, Big Block Cast Steel Roller Tip Rocker Arms SUM-141709PL

Rocker Arms, Roller Tip, Cast Steel, 7/16 in. Stud Mount, 1.72 Ratio, Polylocks, Chevy, Ford, Set of 16

Part Number: SUM-141709PL

3.88 out of 5 stars ( 24 )

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

AFR Rocker Arm Stud Girdle Replacement Nuts 6214-16

AFR Rocker Arm Stud Girdle Replacement Nuts 6214-16

AFR Rocker Arm Stud Girdle Replacement Nuts 6214-16

Rocker Arm Nuts, Stud Girdle Replacement Nuts, Full Roller, Polylock, 7/16-20 in., 2.00 in. Overall Length, Set of 16

Part Number: AFR-6214-16

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Crower Sure Lock Rocker Arm Nuts 86050S-16

Crower Sure Lock Rocker Arm Nuts 86050S-16

Crower Sure Lock Rocker Arm Nuts 86050S-16

Rocker Arm Polylock Nuts, Short Design, 7/16 in.-20 Thread, Set of 16

Part Number: CRO-86050S-16

4.85 out of 5 stars ( 26 )

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Summit Racing™ Rocker Arm Stud Girdles SUM-141003

Summit Racing™ Rocker Arm Stud Girdles SUM-141003

Summit Racing™ Rocker Arm Stud Girdles SUM-141003

Rocker Arm Stud Girdle, Clamp-On, 7/16-20 in., Polylock, Aluminum, Black Anodized, Chevy, Big Block, Kit

Part Number: SUM-141003

1.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Summit Racing™ Cast Steel Roller Tip Rocker Arms SUM-141702PL

Summit Racing™ Cast Steel Roller Tip Rocker Arms SUM-141702PL

Summit Racing™ Cast Steel Roller Tip Rocker Arms SUM-141702PL

Rocker Arms, Roller Tip, Self-Aligning, Cast Steel, 3/8 in. Stud Mount 1.6 Ratio, Polylocks, Ford, 289, 302, 351W, Set of 16

Part Number: SUM-141702PL

1.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Summit Racing™ Cast Steel Roller Tip Rocker Arms SUM-141701PL

Summit Racing™ Cast Steel Roller Tip Rocker Arms SUM-141701PL

Summit Racing™ Cast Steel Roller Tip Rocker Arms SUM-141701PL

Rocker Arms, Roller Tip, Self-Aligning, Cast Steel, 3/8 in. Stud Mount, 1.6 Ratio, Polylocks, Chevy, 305, 350, Set of 16

Part Number: SUM-141701PL

4.33 out of 5 stars ( 3 )

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Summit Racing™ SBC Cast Steel Roller Tip Rocker Arms SUM-141707PL

Summit Racing™ SBC Cast Steel Roller Tip Rocker Arms SUM-141707PL

Summit Racing™ SBC Cast Steel Roller Tip Rocker Arms SUM-141707PL

Rocker Arms, Roller Tip, Cast Steel, 3/8 in. Stud Mount, 1.6 Ratio, Polylocks, Chevy, Small Block, Set of 16

Part Number: SUM-141707PL

4.71 out of 5 stars ( 7 )

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Summit Racing™ Cast Steel Roller Tip Rocker Arms SUM-141705PL

Summit Racing™ Cast Steel Roller Tip Rocker Arms SUM-141705PL

Summit Racing™ Cast Steel Roller Tip Rocker Arms SUM-141705PL

Rocker Arms, Roller Tip, Cast Steel, 7/16 in. Stud Mount,1.52 Ratio, Polylocks, Pontiac V8, Set of 16

Part Number: SUM-141705PL

Not Yet Reviewed

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Summit Racing™ Cast Steel Roller Tip Rocker Arms SUM-141703PL

Summit Racing™ Cast Steel Roller Tip Rocker Arms SUM-141703PL

Summit Racing™ Cast Steel Roller Tip Rocker Arms SUM-141703PL

Rocker Arms, Roller Tip, Cast Steel, 7/16 in. Stud Mount, 1.5 Ratio, Polylocks, Chevy, Small Block, Set of 16

Part Number: SUM-141703PL

Not Yet Reviewed

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Summit Racing™ AMC, Ford Cast Steel Roller Tip Rocker Arms SUM-141708PL

Summit Racing™ AMC, Ford Cast Steel Roller Tip Rocker Arms SUM-141708PL

Summit Racing™ AMC, Ford Cast Steel Roller Tip Rocker Arms SUM-141708PL

Rocker Arms, Roller Tip, Cast Steel, 3/8 in. Stud Mount, 1.6 Ratio, Polylocks, AMC, Ford, Oldsmobile, Set of 16

Part Number: SUM-141708PL

3.94 out of 5 stars ( 17 )

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Crower Sure Lock Rocker Arm Nuts 86050-16

Crower Sure Lock Rocker Arm Nuts 86050-16

Crower Sure Lock Rocker Arm Nuts 86050-16

Rocker Arm Polylocks, Fits 7/16 in. Stud, Set of 16

Part Number: CRO-86050-16

4.75 out of 5 stars ( 4 )

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Crower Sure Lock Rocker Arm Nuts 86051S-16

Crower Sure Lock Rocker Arm Nuts 86051S-16

Crower Sure Lock Rocker Arm Nuts 86051S-16

Rocker Arm Polylocks, Fits 3/8 in. Stud, Set of 16

Part Number: CRO-86051S-16

5.0 out of 5 stars ( 8 )

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Howards Cams Stud Girdle Adjustment Nuts 90126-1

Made in the USA

Howards Cams Stud Girdle Adjustment Nuts 90126-1

Howards Cams Stud Girdle Adjustment Nuts 90126-1

Rocker Arm Nuts, Polylock, Stud Girdle Replacement, Full Roller, 7/16 in.-20 Thread, 0.550 in. Shank Diameter, 2.00 Length, Each

Part Number: HRS-90126-1

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

COMP Cams Rocker Arm Adjusting Nuts 4630-16

Made in the USA

COMP Cams Rocker Arm Adjusting Nuts 4630-16

COMP Cams Rocker Arm Adjusting Nuts 4630-16

Rocker Arm Nut, Full Roller, 7/16-20 in. Thread, Polylock, Each

Part Number: CCA-4630-16

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

Pioneer Rocker Arm Adjusting Nuts 850008

Pioneer Rocker Arm Adjusting Nuts 850008

Pioneer Rocker Arm Adjusting Nuts 850008

Rocker Arm Adjusting Nuts, Non Roller, Polylock, 3/8-24 in. Stud Thread Diameter, Set of 16

Part Number: PIO-850008

3.75 out of 5 stars ( 4 )

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

AFR Rocker Arm Stud Girdle Replacement Nuts 6216-16

AFR Rocker Arm Stud Girdle Replacement Nuts 6216-16

AFR Rocker Arm Stud Girdle Replacement Nuts 6216-16

Rocker Arm Nuts, Stud Girdle Replacement Nuts, Polylock, 3/8-24 in., Use with Small Block Chevy and Small Block Ford AFR Stud Girdles, Set of 16

Part Number: AFR-6216-16

Not Yet Reviewed

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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PRW Power 12-Point Poly Locks 1200123

PRW Power 12-Point Poly Locks 1200123

PRW Power 12-Point Poly Locks 1200123

Rocker Arm Nut, Power 12-Point, Polylock, 3/8 in. Stud, .550 in. O.D. Shank, Set of 16

Part Number: PQX-1200123

Not Yet Reviewed

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Scorpion Rocker Arm Nuts SCPPL716-4

Made in the USA

Scorpion Rocker Arm Nuts SCPPL716-4

Scorpion Rocker Arm Nuts SCPPL716-4

REPLACEMENT POLYLOCK

Part Number: SCC-SCPPL716-4

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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