SBC 492 over the counter heads 68 & 69 LT1 vett heads starting in 1970 -71 strait plug 2.02 int 1.6 ex 64 cc screw in studs guide plates as gm sold them. these heads are completely redone bronz guides ex seats pos seals all has been replaced come complete or bare your choice they where run long enough for a cam break in. no port work has been done