its not at all uncommon for a non-performance oriented machine shop to use pistons like this for a rebuild, because they often just dont check to see how a particular combination of parts will work together, and how much they differ from the OE parts they are replacing. its listed in the catalog for the application.....so they just use it.
We have a local shop that has successfully raced Mopars for over thirty years, they know how to make them run, yet if you take them in a 383 or a 440 for a resto type rebuild it is virtually guaranteed to come back with less than 8.5 C/R, they aren't interested in going through the extra work to make it run...
As a rule having a shop that knows what parts make a good combo is a reason the seek a Mopar oriented shop, any good machist should know how to do the machining but alot don't take the time to work out a good combo of parts & measurments to build a strong running engine...They know what works on a Chevy cause they researched it for their own enjoyment...They know how to build a Ford cause their buddy owns one.... If you want it to run hard you need to select the parts & measure everything or find someone that not only knows but is willing to do it right...
