okay i am looking at buying a LS block and a LS head off of ebay and then building it into a full motor and then turbo it. i have a few questions i am looking at putting Darton sleeves into the block with an 81mm bore what i want to know is what size pistion would i need should i get an 81mm piston also and the other question is about the crank and the rods what would upgrading the stock crankshaft with an eagle one like what would the gains to the car and also about the rod for the piston what length rid should i get and the one last thing is the head gasket would that have to be bored to 81mm also or no.

if you guys can give me some anwsers that would be really good

Thanks