My .030" over 258 has pistons marked "L3103F". Google turns up nothing. Can anyone ID it?
The head appears to be stock; stock size valves, no evidence of porting.
The flat of the pistons come up to approx. .036" of the deck, and the dish on the pistons are 3/16". A Felpro gasket I have, the thinnest point is .050". The piston dish covers most of the piston, so there's not a lot of squish space, but it should be .087". This doesn't sound like high-compression to me (what the engine is alleged to be). I know there's a dynamic aspect to compression but I don't know anything about it, and I have no idea what cam is in there. It's got double valve springs, the inner are flat wire.