Python82

I'm running a single and I have a set of custom fit Lightning exhaust due to the fact that my engine is in back-wards (Arneson Drive). How much taller is the tall deck???

PatriYacht

.400 higher deck.

z.zuperboat

540 with gm heads can make about 600-650hp and a 572 should make about 650-700hp.my short deck 540 same head makes 630.

PatriYacht

A short deck 565 is a good compromise. 4.60 bore x 4.25 stroke.

razor1115

z.z -

I have a 540 standard deck with GM Rect port heads , Dart single plane intake, 950HP, and Crane 741 cam. EMI 4" exhaust. I am at 600hp. What are you running to get 630hp? What RPM?

Bob280Silencer

razor1115,sounds about right.My 540,slightly smaller cam,efi,AFR 315 cnc,650hp @ 5400,677 tq at 3700.Cam Motion (BatonRouge) cam.I told them I wanted tq at low rpm,got it.Don't think you can get to 650 without the heads. My .02 BOB

mcollinstn

Crap no, the GM heads won't be choking at 5200. Those heads came from a high rpm background. In the old days, those heads were the hot ticket for a 7500 rpm 454.

It's got nothing to do with the heads being choked. The ports simply aren't as efficient as a modern head, and require a little cam duration to approach similar results. Because of that, the torque curve won't be as flat and the bottom end will be a little softer (when compared apples to apples with the same motor running Canfields or AFRs). It's all relative.

HPJunkie

Yeah but how "soft' is 600 cubes in any case!!! Do it!!!! Have a blast! Greg

z.zuperboat

Razor you need to open your pm box to get messages,also unable to get email

razor1115

zz

will do...thanks