Posted by CNKS on June 28, 2012 at 09:55:43 from (216.144.104.128):
Or anyone else who is knowledgeable about the subject. My Super M had IH fire crater pistons in it, along with 22 L stamped on the plate below the weights -- I assume this means 22 degrees advance which is supposed to be used with fire craters. The unit is worn and sloppy, with very little noticeable movement from the springs. I am going to replace the whole mechanism, which is still available. Question is--I have a Tisco sleeve and piston, kit with what I will call imitation fire craters with a much lower step than the original meaning less compression. The original pistons are scratched, but the machine shop person says they can be cleaned up and used with the new rings and sleeves. Only the pistons will be used, bushings, etc will be replaced. I need other opinions on that, agree or disagree, AND if it is not a good idea do I still use the 22 degree advance. I assume the 22 degrees is for anything but the original flat top pistons but I need conformation, to know what advance curve parts to order. The 22 degree weight kit part # (not in the parts book) is 374262R91. Messicks.com changed the number to 362723R91. 374262R91 is in the link. Type fire crater in the keyword, click search and page down to the 7th item, #1014153R1. Thanks in advance.
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