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Old 05-02-2012, 04:01 PM   #1
rod
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Join Date: Dec 2009
Location: Kingman, NW AZ. in the middle of the longest stretch of Route 66
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Default 2nd. piston pin ?

sometime back i posted about shortening a pin. this is a forged TRW piston with a 3" Chevy pin.
what i want to do is place 2 .042" Tru-Arc lock rings on each side of the piston. i have now done some serious measuring and i find that there, for whatever reason, is a large amount of end play between the pin and the OEM single lock ring groove, .029" to be exact.
so, if i widen the original groove to the outside by .0275" i can get the 4 lock rings in, and not have to shorten the pin.
this leads to a whole new question. there will be approx. .0875" of material remaining between the outside of the lock ring and the flat face area [on the outside] of the piston.
the question then , is .0875" enough material to hold the ring in place and not be hammered out? currently, in unmodified form there is .111" of material.
.111"-.0275" = .0875"

thanks rod in AZ
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