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.