I have a 91 Si hatch with a B18b motor in it... I was thinking of swapping in some ITR or JE forged pistons with new rings.. How hard is it to swap pistons without pulling the motor out ???

 

Not hard at all, drain all fluids, pull the head, oil pan, windage tray and pop out the pistons... The reason I will NEVER swap pistons in a while the motor is in the car is you cannot overbore the block and that's the only way I'll install pistons period... If you don't mind staying at standard boring and honing out the cylinders yourself then it's not a problem... To me it's worth it to pull the motor, overbore the block, and run OS pistons... Whatever route you take good luck, Peace

 

i'd say its easier to pull it out, what would you do? leave in the crank? just imagine all the hellacious metal shavings you've gotta clean up, and who knows what got on or around the crank, all it takes is a hair to spin a bearing, gotta be careful i'd rather be safe then sorry myself