I also have a 1983 TRW Performance Components catalog, I have the same numbers as Tommy, 645 grams for the bare piston (+or- 4 grams), 150 grams for the pin, (+or-3 grams). Interesting, that to keep the piston at 12.0-1 compression, regardless of bore size, w 69.6 cc combustion chambers, they reduced the dome volume, the STD piston has a .225" tall dome, the .030 piston has a .215" dome, and the 060 piston has a 195" dome. Also interesting, is the weights of the 3 pistons, the STD piston is 640 grams, the .030 is 645 grams, but the .060 piston is only 625 grams.