Quote:

@J body,

Thanks buddy, I can sure let you know. Ideally, I'd like to find a top end already machined properly, the W5 stuff really doesn't seem to be too hard to get a hold of.

Doing the math with a 4.22" bore Siamese block and a 4.25" BPE crank that'd be right at 476 cubes.





You get to a point of diminishing returns will all those inches on a "small head" in a hurry.
My old 422 with w5 heads( pretty racy 9 sec setup) wheezed at 7300/7400 rpm last 100-120 or so feet getting to the stripe.
Those heads on that many inches should probably be put in front of a combine or a planter.....lol

69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, low 10.30’s 1/4
1.41 best 60 foot
6.56 at 104.17