wow, am i the only one that sees that he's referring to hot tanking the block when he says "wash." you guys are just playing semantics here. get a life.
Why the fuck are you going to completely disassemble a motor, hot tank the block, and then reassemble it with nearly stock components?
hence why he was asking about aftermarket pistons...
am i the only one that actually read his posts?

i don't agree with how he's going about this but you guys aren't exactly doing your part to help educate him. i'm just defending him so if that makes me an idiot, so be it. i could care less.

You don't need to replace the pistons at all, unless of course something is wrong with them. 350rwhp is attainable, but don't expect too much more than that without heads and bigger cams. Many guys on here are pushing 500rwhp with stock internals so I'm sure you'll be just fine.
i don't agree with how he's going about this but you guys aren't exactly doing your part to help educate him. i'm just defending him so if that makes me an idiot, so be it. i could care less.