bore specs

Does anyone know what the stoke bore diameter is.?
Doing some head work and when i removed it found the pistons. look ing like new with. 0.50. Stamped on them. When ibought the truck the guy told me it had been rebuild like 50k ago.

.050 stamped on the piston, means... it was bored over .050 mm (metric)which converts to .020 std. oversize (english). I would just stay with that,, as long as there was no knocking noises, or blue smoke. If you overheated it, I would take that head to the machine shop to have it checked for flatness, b4 re-installing it.

cool thanks. Turned out to be my valve guides