Quote Originally Posted by QUICKSILVER462 View Post
If your at the point of replacing main and rod bearings, it make no sence to reuse used piston rings. If the cylinder walls are in good shape, have them honed to install new piston rings. If the cylinder walls are scored, and you have a ridge at the top, you need to overbore, the amount of overbore should be decided by the machinist. If overbore is required, then you will need a new set of pistons and new matching set of piston rings.
On a side not, if the rod and main bearings are being serviced with the pistons still in the engine, meaning if the connecting rods/piston assembly have not been removed to fit new bearings, and you had good cranking compression, than I would say you could probably get by WITHOUT installing new piston rings.

Everything he said ^^^

except for if your going to rebuild your engine without pulling the pistons and rods out of the block, dont bother rebuilding your engine. AND specifically on these l67s measure the cylinders for out of round. Mine had 140k on it and the cylinders didnt even look like they needed honed hardly, but a bore measurement showed that were distorted beyond high hell and needed a full over bore job. I went with the sealed power slugs with moly/ceramic coating in .030.