I’m still waiting to hear back on base circle from Powell & Butler on their RA4 cams but if anyone has a suggestion of a cam for a 455 that works with these lifters I’m all ears. I’m working on a ‘72 455 with 7K3 heads, new valves but waiting to figure out the cam before I purchase new springs. It’s going into a ‘72 GTO with a M20 four speed & 3:23 gears, stock exhaust manifolds (maybe RA manifolds later) with a 2.5” exhaust, just a nice cruiser to hit some shows or grab ice cream with the family. I was going to build this with a RA4 cam so something along those lines but that works with these lifters, let me know if you have any suggestions, thanks!
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1972 GTO
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