Quote:
Originally Posted by Cliff R
Just looking at the engines I've done here 230 @ .050" will get you 500hp with 260cfm heads.
236 @ .050" will get you 550hp with 290-310cfm head flow.
260 @ .050" was worth 650hp with 330cfm head flow (very well prepared Edelbrock round port heads)..
I don't see 248@.050" ever getting you to 650hp even with 20cfm more head flow. Probably closer to 590-610hp with 10 to 1 compression and ideal intake, carb and exhaust system.......FWIW......
An added note here. I was involved but did not build a 455 that ended up making 612hp. It used early KRE aluminum "D" port heads ported to 310cfm. Can't remmeber the exact cam specs but it was a solid roller grind around 245/255 @ .050".. Two different intake/carb combo's were ran on that engine while it was on the dyno.
The new (at that time) Tomohawk intake topped with a 1" spacer and 850cfm carb. We also ran a Victor/Dominator on it. There much bigger Victor/Dominator set-up was only worth about 10-12hp and we made quite a few pulls with both set-ups to get those numbers.
I've also seen the T-II intake, 1" spacer and 850cfm carb set-up rival the Victor/Dominator at that power level on several other 455 builds.
With all that said I don't see the intake/carb being a huge restriction on what you are doing........
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If I can make 620+ with 1 pull (no carb tuning or playing with spacers) and alum d-ports with 243-249 cam then I see no reason real close to 650hp can't be achieved with a little more can and a better exhaust that the round ports offer.