Sorry I fat fingered the number. They are actually GM 12557779. Any idea what ratio they are? I'm going to sell them so I want to be able to provide all the information on them.
IIRC that is the part # for the LT4 RR. If it is a full rocker (not just roller tip one) than those were made by Crane for GM. Are they stamped 1:5 on top?
Correct......and the GMPP version of this rocker that came with the Hot Cam Kit uses a 3/8" stud.
KW
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