I have to replace my screw in rocker arm studs with jam nuts. Should I switch to the larger 7/16, or is 3/8 ok, and should I go with ARP or another brand? I had an old set of 3/8 with the jam nuts and one of them broke off last night. It would be a lot more $ if I swith to 7/16 because then I have to get a new set of rocker arms, balls, and polylocks.
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