Robbins Pistons

I thought these were kinda neat.


TRIUMPH HIGH DOME RACING PISTONS 40+ OVER .
Made here in California  by Robbins for  the  pre-Unit T100C racers / Grand Prix alloy motors of the 1950S era  NOS from an old California race shop  Probably 12-1. made during the time when Triumph dominated the 500CC class in American racing.