Well prepared 915 heads to about 76-78cc. Zero deck with 12 or 13 cc dish pistons (Diamond, ICON... (Diamonds are lightest). Put a 750 gram rod in it. Solid lifter cam designed for manifolds. 2 1/2" mandrel bent exhaust with DynoMax UltraFlo mufflers. Get the tune right as rain, and you should be at a solid 475 hp.
You Did - so if thats max with stock crank - then i guess im thinkin thats a tad light .
This will be a numbers block , so no chinese rods/pistons
But The chinese crank might be ok .
Its too bad you lose stock pickup with 512 stroker - or NOt ?
