Quote:
Originally Posted by Jay S
With HFT cams it might be better to break it more up into spring pressures that you have to run to control the valves for the cam and rocker combination, 260lbs at max lift is mild, then 260 to about 350 would be medium, with the high end of that range starting to get aggressive, and 350 and up very aggressive. For seat pressure 90 or less is mild, 100 to 130 medium, after about 120 seat pressure is getting aggressive on a HFT, past 130 is getting very aggressive for a HFT.
There were some original 744 combinations that were actually at least moderately aggressive, even though they only had .407” lift.
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Jay, I've read the 744 had/has terrible valve train dynamics, from the low lift combined with the long duration, do you think that's why Pontiac used some heavier springs even though it had low lift?
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78 T/A 4SPEED, Original paint, match #’s, stock original bottom end, milled 6x-4s, HE268H cam,17058263 Q-jet/ 72 jets, CH secondary rods, RA Manifolds, poly body bushings, Moroso SFCs, 3rd and last owner since ‘99, as long as I'm alive.
79 Parisienne originally 305 2bbl now 87 350 tbi swap, 193 heads, performer, Q-jet, headers
77 t/a sold
85 Monte Carlo SS sold
83 Mustang GT sold
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