Brian - no they usually aren't stamped with the size. Take one to a machine shop and have them micrometer it to tell you the size (I'll be stock). Or you could micrometer the bores (usually how it is done).
Do you mean 0.006"? Less than 0.001" is very rare (and unsual) for forged pistons. The stocker cast pistons want like 0.0008 - 0.0016". My venolia want 0.005". Also, stock bore is 91.1 mm (3.587") - according to the overhaul manual.
A forum community dedicated to all Mitsubishi 3000GT and Dodge Stealth owners and enthusiasts. Come join the discussion about performance, modifications, VR4 turbo upgrades, troubleshooting, maintenance, and more!