Seller said it was run in a Delaware car years ago. He bought it when he was 16 or 17 yrs old. He's now 56. Oiled and spun over it's free,standard bore. The suffix is Z I ; from a 4 speed car,piovt ball is in photo. Early Jan. '66 casting date. This is one of the 2 blocks made for '64 - '67 Chevy II's. An early Chri...