wrong spec submitted by MOPAR

[Irv Johns]

Originally Posted by Pvt Parts

Hey all those things are understandable but the bottom line is that this is NHRA drag racing, not Mopar factory racing and if the parts don't meet the NHRA specs, they are not legal.

In my case there were no piston specs for the 392 till March of this year. My engine was built with Diamond pistons as per NHRA specified with NHRA Logo and Diamond pistons engraved on top (early Drag Pak pistons had no engraving on top that was added after the first ones went thru teardown). There was no part number or ring spec in book til this March. My engine builder only had what was available for specs last June when my engine was built. He trusted Diamond to build pistons per NHRA as they were a approved vendor.