1970 "CRR" coded 512 4-bolt main block standard bore, never decked, dated J-31-9. Bores have been greased, and has been in storage for quite a while. Selling this for a friend, who is looking for best offer on it. He doesn't want to list on eBay, so I recommended putting a listing on here. Please e-mail me at
[email protected] if interested.