I see about .05-.08 seconds improvement and nearly 2 MPH if I shift clear up at 5800rpm vs 5000. Since I use Crower HIPPO lifters on the OF cam it spins right past 6000rpm's quickly with no indications of giving up but I don't think the cam is big enough to be making power up that high. Certainly not enough improvement to push the engine that hard, and 455's are pretty hard on internals by design so lower shift points only make sense for bracket racing and such......
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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