Originally Posted by hink
Originally Posted by altereddoug
What all is required when purchasing a new block?
Any other machine work? I am looking at the big M 9.8 deck 4.5 bore. And the actual bore the way it is sent is 4.490? for part number 31263444
Doug
On the Dart blocks SBC and BBC the blocks need to be line honed, lifter bores clearanced, decked and plate honed, freeze plug holes chamfered along with the thrust on area on the rear main cap.
The bore spacing on a BBC I thought was 4.480
i don't know about your dart blocks but my big M was right in the middle of the spec on the mainline.