I don't really notice the difference. One cylinder has a -48 part number. The guys that know will point to fins and a weird, little boss. One thing for sure, these were pitted from "bad storage." The gasket surface was very rough and pitted.
MFM (
McFarland Machine I call him) . . . indicated, and utilized a live-center cone and turned these cylinders -.010 off the head gasket, and -.007 off the base to clean 'em up. I had to check the fire-ring flange vs. the cylinder head chamber depth - to verify depth to compress the head gasket fully . . and we do - all ok . . . Now we have equal lengths and flat, true surfaces for our head and base gaskets.
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