A LOT OF MONEY!!! Oh did I mention a lot of money, yeah ur gonna need that. Cylinder $850, Pistons $250, Crank $450, TZ bearings $100, Domes $70, Coolhead $150, Portwork, $350-400, Stud xtenders and plugs $35, Wristpin bearings $25, Oring kit $25, Labor...Who the fuck knows how much thatll cost you. U having second thoughts yet???? Took me a long time to get to a 421 and thousands of dollars later, here I sit happy. Ooooooh, I almost forgot, PIPES.....$400-600.