I'll check into those....I've had the motor for a little over a year...it still runs like a bat out of hell.....it's just now and then you break a rocker...and it's not always the same number. It was running great....doing nice burnouts......then on the way home..."POP POP" messed up number one (a) rocker and number one (b) pushrod. Gets tiresome after awhile....was supposed to have been built by someone that knew what they were doing...but ya never know. Thanks for the input guys