Dyno Guesses & Bench Racing Forum - 383 build HP guesses

Just looking for some guesses at the final WHP of this build. Hoping for 450-500.

Eagle 4" crank
wiseco -8cc pistons
PRC stg2.5 5.3 heads milled to 61cc's
234/238 .602"/.615" cam
LS7 lifters
LS6 intake
36# Injectors
pacesetter 1 3/4 headers

should be about 11:1 CR
...and a whole mess of gaskets, etc for the rebuild.

Looks like you're about right. But that's my desktop butt dyno talking.

i would say about 450-460 rwhp with a good amount of torque

yeah that should work nicely man I'd love to see the dyno results

Any advice if upgrading to a walbro 255 would be worth it on this build? It's going into an 04 GTO.

Any other opinions on the numbers would be appreciated too.

I room my 408 to 8,000 rpms in my 04 GTO with stock pump and 60lb injectors....I've never had a low fuel pressure issue

Those 36# injs are going to "have their tongue hanging out" at 500RWHP....rerun the math using FWHP.

I agree with old geezer....look around for some 42lb injectors because the ones you have now will be maxing out pretty quick

Im at 92% duty cycle on my red top svo 30lb/hr injectors on my c5z. 463whp

Forgot to add thats @ 7200rpm

I have different heads, out of the box AFR 205s and 238/240 cam through 1 3/4 headers and LS6 intake making the numbers in my SIG