Krooser
Building Chinese Free Engines since 1959...
Well people talking about the 4 speed and weight made me reevaluate the rear end. I don't have anything against running a Dana 60 so might as well and play it safe. As for the W9s I figured those are the cream of the crop for W series heads so having those with the small chamber and a flat top piston vs. an open chamber w2 with domed pistons would help me get both the 12.5:1 or 13:1 I want and would greatly reduce piston weight which meant better for the 7,000 rpm.
The issue you will have with any SBM is crank weight. My billet 3.79 crank weighs 63#'s. Stock 3.31 crank is 57#'s as I recall. The typical SBC dirt racer can get a a 39# crank...makes a ton of difference.
I tried to get a lighter crank built... talked to SCAT, Windberg and Bryant. Lightest they build is over 50#'s. Six month wait. And several thousand dollars.
I'd spend my money elsewhere.
BTW I have a 13.5-1, 388" 360 with W2 heads running on moonshine. Crower billet rods. RaceTec pistons. The next build will be a 340 +.060 with a 3.79 crank, Brodix B1BA-MC heads.