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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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Polylocks, 3/8 in. Thread, .550 in. Diameter, Set of 4
Part Number: CSP-PL038K
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
BUILD IT WITH SUMMIT!
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
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Rocker Arm Nuts, Polylocks, Roller Rocker Arms, 7/16 in.-20 Thread, Set of 4
Part Number: CSP-PL716K
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
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
Estimated Ship Date: Monday 4/27/2026 if shipped by air
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
Estimated Ship Date: Monday 4/27/2026 if shipped by air
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
Estimated Ship Date: Monday 4/27/2026 if shipped by air
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
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Rocker Arms, Roller Tip, Cast Steel, 7/16 in. Stud Mount, 1.72 Ratio, Polylocks, Chevy, Ford, Set of 16
Part Number: SUM-141709PL
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
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
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Rocker Arm Stud Girdle, Clamp-On, 7/16-20 in., Polylock, Aluminum, Black Anodized, Chevy, Big Block, Kit
Part Number: SUM-141003
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Rocker Arm Polylock Nuts, Short Design, 7/16 in.-20 Thread, Set of 16
Part Number: CRO-86050S-16
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
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
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
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
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
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
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
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
Estimated Ship Date: Monday 4/27/2026 if shipped by air
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
Estimated Ship Date: Monday 4/27/2026 if shipped by air
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
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
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
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Rocker Arm Nut, Full Roller, 7/16-20 in. Thread, Polylock, Each
Part Number: CCA-4630-16
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Rocker Arm Polylocks, Fits 3/8 in. Stud, Set of 16
Part Number: CRO-86051S-16
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Rocker Arm Adjusting Nuts, Non Roller, Polylock, 3/8-24 in. Stud Thread Diameter, Set of 16
Part Number: PIO-850008
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Rocker Arm Polylocks, Fits 7/16 in. Stud, Set of 16
Part Number: CRO-86050-16
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Rocker Arm Nuts, Polylock, Stud Girdle Replacement, Full Roller, 7/16 in.-20 Thread, 0.550 in. Shank Diameter, 2.50 Length, Each
Part Number: HRS-90127-1
Not Yet Reviewed
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Rocker Arm Nut, Power 12-Point, Polylock, 7/16 in. Stud, .600 in. O.D. Shank, .550 in. Undercut, Set of 16
Part Number: PQX-1200127
Not Yet Reviewed
Estimated Ship Date: Monday 4/27/2026 if shipped by air
Estimated Ship Date: Monday 4/27/2026 if shipped by air
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
Estimated Ship Date: Monday 4/27/2026 if shipped by air
