Im new to this site so help me out ..Right now I have vatara pistions. My 1st and 2nd cylinder aren't working, dont no why, I bought ngk wires an iridium spark plugs but nothing happened ! I asked one of my friends an he said that the cylinders might be dead. . Anyways I was wondering if that block would still be good if I bought new pistons an rebuilt that one !. WHAT Pistions do u suggest to run atleast 20lbs of boost witout having a problem .