Don Dulmage used the Racer Brown Cams and that was his “go to” profile; specifically the STH42 ([email protected]”) 108LC Hyd. I have one of those in the Poly cam profile. The advancing and retarding according to engine RPM is characteristic of the Rhoades Variable Duration lifters (still marketed) that shortened duration at low RPM to retain vacuum for accessories, better idle quality for street use and then increased duration as RPM increased. Hughes Engines also has the variable duration set marketed under their name. Gary Pavlovich From: 1962to1965mopars@xxxxxxxxxxxxxxxx <1962to1965mopars@xxxxxxxxxxxxxxxx> On Behalf Of neal zimmerman I don't think they've made that in years. and I am not sure it was them that made it. I just remember don dulmage talking about it neal On Tue, May 17, 2022 at 11:22 AM <62-65-mail-list-club@xxxxxxxxxxx> wrote:
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