[3macs1]

Never knew that Barry. Wish I did. Been around these big blocks since my first chevelle in 76 and worked on dozens of them when I worked in the service station. Never before did I see a 4 bolt block on a factory oval port other than the tall 366 and 427 truck blocks.There probally was not that many in the initial run of 70 454's.
Any idea Rick or Mr.70 how many oval port 512's may have been sold with 4 bolt mains and steel cranks. Rods and pistons were oval port gear.