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ARP Perma-Loc Rocker Arm Adjusters

4.89 out of 5 stars 65 Customer Reviews

Stop your rocker arms from loosening forever with these ARP Perma-Loc rocker arm adjusters. Made from heat-treated, premium-grade 8740 chromoly steel, these adjusters provide 190,000 psi tensile strength for the utmost in reliability. Other features include exclusive heads with special shouldered stops to hold the adjusting wrench, precision CNC-machined threads to ensure optimum seat pressure, flush-machined set screws for proper contact on the studs, and, best of all, they don't require any special tools for installation.

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ARP Perma-Loc Rocker Arm Adjusters 300-8243

Made in the USA ARP Perma-Loc Rocker Arm Adjusters 300-8243

ARP Perma-Loc Rocker Arm Adjusters 300-8243

Rocker Arm Nuts, Roller Rockers, 3/8 in.-24 Thread, .550 in. Outside Diameter, Set of 16

Part Number: ARP-300-8243

5.0 out of 5 stars ( 9 )

Estimated Ship Date: Monday 10/20/2025

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Estimated Ship Date: Monday 10/20/2025

ARP Perma-Loc Rocker Arm Adjusters 300-8242

Made in the USA ARP Perma-Loc Rocker Arm Adjusters 300-8242

ARP Perma-Loc Rocker Arm Adjusters 300-8242

Rocker Arm Nuts, Stamped Steel Rockers, 7/16 in.-20 Thread, .650 in. Outside Diameter, Set of 16

Part Number: ARP-300-8242

4.93 out of 5 stars ( 15 )

Estimated Ship Date: Monday 10/20/2025

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Estimated Ship Date: Monday 10/20/2025

ARP Perma-Loc Rocker Arm Adjusters 300-8241

Made in the USA ARP Perma-Loc Rocker Arm Adjusters 300-8241

ARP Perma-Loc Rocker Arm Adjusters 300-8241

Rocker Arm Nuts, Stamped Steel Rockers, 3/8 in.-24 Thread, .620 in. Outside Diameter, Set of 16

Part Number: ARP-300-8241

4.76 out of 5 stars ( 21 )

Estimated Ship Date: Monday 10/20/2025

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Estimated Ship Date: Monday 10/20/2025

ARP Perma-Loc Rocker Arm Adjusters 300-8246

Made in the USA ARP Perma-Loc Rocker Arm Adjusters 300-8246

ARP Perma-Loc Rocker Arm Adjusters 300-8246

Rocker Arm Nuts, 12-Point, Roller Rockers, 7/16 in.-20 Thread, .600 in. Outside Diameter, Set of 16

Part Number: ARP-300-8246

4.83 out of 5 stars ( 6 )

Estimated Ship Date: Monday 10/20/2025

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Estimated Ship Date: Monday 10/20/2025

ARP Perma-Loc Rocker Arm Adjusters 300-8245

Made in the USA ARP Perma-Loc Rocker Arm Adjusters 300-8245

ARP Perma-Loc Rocker Arm Adjusters 300-8245

Rocker Arm Nuts, Roller Rockers, 7/16 in.-20 Thread, .550 in. Outside Diameter, Set of 16

Part Number: ARP-300-8245

5.0 out of 5 stars ( 11 )

Estimated Ship Date: Monday 10/20/2025

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Estimated Ship Date: Monday 10/20/2025

ARP Perma-Loc Rocker Arm Adjusters 300-8244

Made in the USA ARP Perma-Loc Rocker Arm Adjusters 300-8244

ARP Perma-Loc Rocker Arm Adjusters 300-8244

Rocker Arm Nuts, Stamped Steel Rockers, 3/8 in.-24 Thread, .600 in. Outside Diameter, Set of 16

Part Number: ARP-300-8244

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Monday 10/20/2025

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Estimated Ship Date: Monday 10/20/2025

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