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

Re: 2nd. piston pin ?
 

Avoid using Tru-Arc retainers if at all possible. There is a very good reason that people use either round wire retainers or double spiro-locs, and it is not because Tru-Arc retainers are real reliable. Those things are "okay" at best for a stock rebuild, in a restored car that won't be driven a lot. In a modern race or high performance engine, they are a recipe/invitation for disaster.

Re: 2nd. piston pin ?
 

Is a pressed pin out of the question, or maybe nylon buttons...?
http://content.screencast.com/users/...2-18.55.35.jpg