horsepower estimate?

  • Thread starter Thread starter Tresker
  • Start date Start date
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Tresker

Anyone here good at estimating horsepower/torque?

I've got a pontiac 400, with stock big valve, #16 heads, 9:1 compression, large tube headers, 4 barrel dual plane, 223/231@.050 .465/.488 lift.

How much power should I be making??
 
425hp 450tq at the crank
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Sorry for the wait. Block is a 75 and bored .040 over.

I'd love to have it dynoed, cause I really need to tune it better, but I wouldn't even know where to go or how much to spend.

I'd be ecstatic to find 425 horses. Do you mean gross or net?
 
Last edited:
Net at the crank. About 340 at the wheels. Good enough for 12's in a properly setup car weighing 3500 lbs.
 
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