Hello! I'm looking into doing a PI swap over this summer, just wanted some opinions on parts: How much should one pay for used cylinder heads? And what should I look for when buying used heads, are there any easy places to see signs of wear/leaks? Would it be better to just buy new ones for 500 or so? I'll definitely take any used pair I buy to the machine shop to get checked out anyways... just wondering if new ones would be a better deal! Thanks!