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400 WHP is going to take approx 470 at the flywheel with a standard and 500 at the flywheel with an auto, asuming 15% and 20% drivetrain losses, respectively. I have an MM&FF here thats a couple years old that lists some fairly solid 302 and 351 combos. Here is a 347, 10.2:1 compression, eagle H-beam rods, AFR 185's CNC ported, vic jr. intake, 750 speed demon with a 1" spacer, 1 3/4 long tubes, 232/240 .565/.574 w/1.6 hydro cam, final output was 486 HP @ 6200 453 ft-lbs @ 5300. That is about as much power as you can make out of a 302 with a hydraulic roller, but even spinning to 6200 RPM's would make me feel pretty uneasy running a stock 302 block after a while, you gotta remember they are VERY prone to splitting in half. IMHO, go with a 351, even if it's just a .030 over motor with stock crank and rods, you will hit your goal much easier and much more reliably with a 351.
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