Quote:
Originally Posted by geeteeohguy
I don't like the look of the scratch in the first cylinder in the first photo. Looks like it could be a crack?
I would disassemble the engine and have the block sonic checked for cyl. wall thickness and cracks. I would check the cylinders for taper and out of round. If not too bad, you can have pistons made at .065 or .070 oversize, and even have dished pistons to run on pump fuel. Some 389's can go as much as .090" oversize if they are thick enough, but you need to have it checked.
Another solution is to sleeve the cylinders, which is expensive and IMO, not as nice as a regular block that is properly refinished oversize.
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X 2. 66 389s can be a crap shoot. I know of two blocks that had to be scrapped due to incredibly thin( like .090) cylinder walls in standard bore engines. I would have the block ultrasonic tested before going further.