o.k., I got my set of "Koppers" All American "Hammered" Piston Rings, still in the original box from the guy on e-bay. My next question is, did GMC use a different ring style in their 235 than Chev. did?
The reason I ask is because the new rings are nothing like the orig. ones I took out. They are the same size (1/8 x 3 9/16, 1/8 x 3 9/16, and 3/16 x 3 9/16) but they are considerably different in style. The 2nd comp. ring has a groove in the face, and has 3 "pressure ducts" (so called by mfg.) on the bottom. Also, the oil ring is a cast ring with slots milled in it, instead of the more common zig-zag style (VVVVVVV) ring.
They also seem pretty tough to compress with my ring compressor. I haven't tried putting any pistons in the block yet, but I checked the end gap and they seem to be right on.
Just wondering if this was a GMC thing, or "Koppers" own variation of the original?
