The fastest I've spun my 400 to was 6300. I didn't realize it was spinning that fast at the time and will keep it at under 6k from now on, but I know I could get more out of it if I had put a better bottom end in it. I conditioned and peened a set of factory rods and have a nodular crank in the motor with TRW pistons. See my signature for more info on the motor.
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1969 GTO
.040 over 400, 68cc #62 heads, stump puller cam
TH400, 3.31 posi
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