I didn't mean to knock the fact your going to dyno your eng because as I said its great for tuning the eng for max performance. I just meant that just because the dyno #'s may be more then someone else's don't mean your car will automatically be faster. So many times I hear of dyno #'s of much more hp then I might make but yet there car is not as fast at the track. Thats what we mean when we say no matter what the dyno #'s are the track will always tell how the car performs. Ron

Yes sir, I know what you mean. I agree with you. All the horsepower in the world is useless if you cant put it to the ground. Hope you have a Merry Christmas.

When you said Crossram I was thinking those big long snaking tube type crossram that the 383,s and 413,s had.

I see now that the 426 crossrams were the bigger box type crossrams.

Still though, even if its the 426 Box type crossram you have at around 9.5 comp the hp wont be stellar IMO.

I remember seeing a dyno of a 446 Box type crossram with 9.75 comp and the MW manifolds and 244 @.050 .520 lift solid. It made 432 HP with the manifolds and Surprisingly only about 446 something with 1.7/8 headers. I guess those MW exhausts arent all that restictive after all.

But with 244 @ .050 and 9.75 comp, it showed about 1 HP per CI Im going to assume your 493 9.5 with a 254 @ .050 Roller will have a little more ooomph to it per CI, but how much,

Im going to raise my guess to 550 or so, I just dont see 600 anywhere. The Stock exhaust MW may be okay for the 446 engine but lay flat with the extra cubes of the 493.

Whats great is, we will get to find out. Whens the planned Dyno day?

And Welcome to the BB builds.

The previous owner of our car had a 493 with 286 heads and a Bullet 313/321 roller cam that made 614 HP using a stock cross ram and Edelbrock 750 AFBs. I'm guessing compression was about 12-1. The manifold will be the limiting factor as it is sized to flow 426 cu-in. We picked up 3 tenths going to a 440-25 intake. Car ran a best of 10.30's with the stock cross ram and 440-1 heads.

Looks like an identical engine to mine. Thanks for the heads up.

there is a point on the compression ratio where the lower compression ratio motor of the same C.I. will make more torque than HP Been there ,done that a lot of times I think bewteen 9.5 and 10.00 to 1 with iron heads and between 10.5 and 11.5 to 1 on aluminum headed motors with pump gas E85 does the same thing, more torque than HP under 12.0 to 1 for me so far

We have a backup motor we ran a few years ago that is a 440, 11-1 compression, 590 MP cam, ported 286 heads, stock cross ram with 750 Edelbrocks. Never dynoed it, but it ran consistent 11.20's in the sig car.

This build is interesting.
http://fepower.net/simplemachinesforum/index.php?topic=1012.0

Good luck with your build, and am looking forward to your results! There might be some room to push the compression up a touch, as you look to have a fairly long duration cam going in. My buddy's iron head 452 build got away with 10.2 compression on 92 non oxy pump, running a 268 @ .050 duration hydraulic cam. It showed a cranking compression of 168 or so on a web site calculator, and I thought you might want to optimize that for your build, especially since it will probably have decent quench?