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5737cc Suspension::Air Suspension Kits 1973-1974 GMC K15/K1500 Suburban Base V8
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ARP Adjustable 7/16 12pt Rocker Arm Nut Kit - arp300-8242 import_2022_03_21_012537 5737cc Suspension::Air Suspension Kits 1973-1974One 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).
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