LS 6.0L & 6.2L FLAT TOP - compatable with LS3 / L92 style rectangular port heads 417cid 4.075 x 1.105CH, 4.000stroke,6.125rod,0.927pin,-4.3cc,430g,11.3CR, 4032.
LS 6.0L & 6.2L FLAT TOP - compatable with LS3 / L92 style rectangular port heads 429cid 4.070 x 1.045RCH, 4.125stroke,6.125rod,0.927pin, -7.8cc,421g,11.2CR, 2618.