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C123 piston and head interferance!
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Posted by Jack in OH on March 29, 2006 at 15:32:26 from (71.50.237.187):
This is a total rebuild of a C123. Engine kit from Tisco with stepped head pistons. The original pistons were also stepped but they were IH which has the stepped portion off center. The tisco pistons have a lower step but it is centered on the head of the piston. After I put the head on and torqued I was going to adjust the valves but I couldn't turn the motor to TDC, the pistons hit the head. The combustion chamber cast in the head won't accomodate the new piston step on the manifold side. I might have to do some grinding or go with a flat top piston. Tisco said they haven't seen this before and to grind the stepped area enough to clear. My machine shop guy is coming over to look at it and thinks grinding the head might work. It is probably only about 0.040" in height. Also , this might be a high altitude head according to the engine block serial number. Just thought I would pass this along, it might help someone else. Jack
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