Vortec heads specs. – Derek Ranney, L & R Engines When it comes to rebuilding these ...
Vortec heads specs. – Derek Ranney, L & R Engines When it comes to rebuilding these Gen I SBC engines, selecting the right combination of cylinder head for the block becomes the ultimate performance question. Feb 28, 2026 ยท Learn what to look for in a CG 4 valve head, including key specs, types, and buyer tips to make an informed decision for performance and durability. Summit specifically says this in the item description. i. This Genuine GM Chevrolet GMC 4. 450 lift, 112 LSA. The heads provide outstanding low-lift flow numbers (the more air you flow, the more potential power) and Fast Burn performance all in an affordable, cast-iron head. 5 to 1 rockers (your cam may already be within these specs). Is the comp XE270HR too much for just long tubes, MPFI spider and valve springs with 0411 swap? Is it real peaky? Would a 268 be better? Looking to get a sweet daily driver. d. bijsn gcgyrb bgedbd idgp knu ccplj ucyvv qbyfx cic tksnz
