maybe i missed it but are you running a auto or manual transmission?
a friend of mine has a 502 bbc and it makes just under 700 flywheel but only 425 rear wheel on the dyno. tci told him to ignore the numbers because of the torque converter. the car was running 10.00's in the 1/4 in a 4300lbs '79 trans am though so 425rwhp wouldn't be enough to do that.
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