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6555cc Fuel Delivery::Fuel Tanks 1968-1969 Buick Skylark Custom L6
-cc Drivetrain::Diff Covers 2011-2012 Ford F-150 Harley-Davidson Edition V8
2004-2005 Ford F-250 Super Duty Harley-Davidson Edition V10
-cc Gauges & Pods::Gauges 2004-2006 Ford Crown Victoria LX Sport V8
-cc Gauges & Pods::Gauges 1994 Oldsmobile Achieva SC V6
ARP Adjustable 7/16 12pt Perma-Loc Rocker Arm Nut Kit - arp300-8245 missing-image 6555cc Fuel Delivery::Fuel Tanks 1968-1969One of the more aggravating things found in many high performance engines is constantly having to re adjust rocker arms. Until ARP introduced the patented Perma Loc adjuster, there wasnt a poly lock on the market that you didnt have to continually tighten. There are several important reasons why ARPs exclusive Perma Loc rocker arm adjusters wont loosen like others. First, the adjuster body is heat treated all the way through (not just case hardened).
