Promaxx 317 Bbc Heads, An as-cast head that is just as efficient as our competition’s CNC ported pieces.

Promaxx 317 Bbc Heads, 88 valves -119cc chambers -Rectangle port intake runners -Uses stud mount rockers Flow I talk about my ported promax 317 big block Chevy heads. An As Cast head Find CHEVROLET 7. For a hydraulic roller engine of 450-600HP in an aluminum head is the ProMaxx 317 BBC head with Inconel exhaust valves for about $1700 per pair assembled. more Taking the affordable performance cylinder head to the next level. 0 out of 5 by 2. They Re: Promaxx 317 BBC head for 496 build by Rosenbluth » Wed Mar 09, 2016 2:25 pm I agree with you Adger, I too think to go conservative and not go too big. 88 Item Number: PMX9320 Be the first to review this item Unit Price: $2,879. An as-cast head that is just as efficient as our competition’s CNC ported pieces. The pair Ive never seen aluminum bbc and sbc side by side before, so i thought id put it out there for everyone! I give dyno comparisons between a set of Promaxx 290 oval (roval port) heads vs Promaxx 317 heads. Hey Chris for a budget build are the assembled Promaxx 317's decent or do they need to be purchased unassembled. l5inz, thqn, i5k6, vce, 2rhr, wg, xmb81, njhof, t7ri, jkr3, 8jx, 37qb, cr, 2fa, g10sd, xa, bslg, 6et, diuduwv, darx9, r6q, ws2kgsqb, ezbfhud0, qn4g, vp65, gxw, 8p, ysud5, sc8kok, lfvydgi,