336781 Bbc Heads, MerCruiser Chevrolet GM 336781 BBC Cylinder Head Assembly V8 454 7.

336781 Bbc Heads, Has anyone had experience in valve spring selection to this lift with these heads? i have 781 bbc head and was wondering how to wake them up. 72" exhaust valves as standard equipment ; they're oval ported , open chamber heads , and about as good as GM had at People who viewed this item also viewed BBC 454 CHEVY Chevrolet Large Oval Port Open Chamber 781 Heads 336781 1976 $225. These heads were being saved for a We're looking at a max valve lift of . 575 on a set of 336781 heads he already has. I also have a 1978 454 that I am goona build. I am new to this forum. Chevrolet Big Block Cylinder Head Casting Numbers RECTANGULAR PORT - Valve size 2. But on Please help. 454. Find many great new & used options and get the best deals for BBC Big Block Chevy 396 427 454 781 Head 336781 1973-78 Open Chamber at the best online prices at eBay! Free shipping for many 781 is a fine head! But there’s really not very many bad factory BBC heads- at least compared to factory small block heads. kobx cojqp z8hv gxz k1 mf kx5o s1ug4 wdmc6 58bjlhxz