427 Chevy Big Block - Standard Bore - 4 Bolt Main - October 1969 Date Code. Block is standard bore and has been decked .010 - It is clean and in great condition. Stamped date code of J109 (October of 1969). It's story.....I purchased this block in June of 1989 with plans to restore a 1969 Corvette 427/435. Purchased from Bruce Shaw of Pennsylvania. Once I got home, I took it to Batten Performance (Romulus, Michigan) in July of 1989 to have them check it out. They did 3 measurements on all 8 cylinders and also took the main bearing cap measurements. See picture for these measurements. Since then, this block has been kept on a custom wooden engine stand (to keep it off the floor), completely covered and stored inside. Obviously never did restore that Corvette! This can be picked up in Pahrump, Nevada - 60 miles west of Las Vegas. Or I would be willing to securely crate it (palleted and covered) providing YOU make arrangements for a shipping company to pick up. Message with questions.