Dyno'd my 383 w/ stock heads
They really aren't even that good. Most cam only 350's are putting down 355-370. I'd be really upset if my setup didn't put down better numbers than that.
IMO it did exactly what it should have done w/ the mods he used. Low HP # = obvious restriction in the heads, bigger torque # = the result of the larger bore/stroke. It probably makes that torque number nearly across the power band too.
I've had both (cam head 355 and 383) the 383 is a ton more fun to drive.
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Any new #s from your end of the country?

