Dyno Guesses & Bench Racing Forum - 383 build HP guesses
04-09-2012, 05:12 PM
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
pacesetter 1 3/4 headers
should be about 11:1 CR
...and a whole mess of gaskets, etc for the rebuild.
04-09-2012, 05:15 PM
Looks like you're about right. But that's my desktop butt dyno talking.
04-09-2012, 06:06 PM
i would say about 450-460 rwhp with a good amount of torque
04-09-2012, 06:56 PM
yeah that should work nicely man I'd love to see the dyno results
04-10-2012, 11:12 PM
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.
04-11-2012, 06:21 AM
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
04-11-2012, 06:26 AM
Those 36# injs are going to "have their tongue hanging out" at 500RWHP....rerun the math using FWHP.
04-11-2012, 06:57 AM
I agree with old geezer....look around for some 42lb injectors because the ones you have now will be maxing out pretty quick
04-11-2012, 11:17 AM
Im at 92% duty cycle on my red top svo 30lb/hr injectors on my c5z. 463whp
04-11-2012, 11:18 AM
Forgot to add thats @ 7200rpm
04-11-2012, 11:44 AM
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
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