What Radar said, I'd get a new bathtub gasket & mock it up to see if the sides have been milled the right amt for spot on port alignment & if good install it w a THIN/EVEN coat of permatex #2 on both sides of the 8 port holes in the tin and I think there are now several varieties of RTV that will holdup there also. Still bad, if you have access to shop air & can borrow a leakdown gauge set, see what you get but I'm bettin on the valley pan gasket EDIT read this (5 minutes). "breakin secrets" at www.mototuneusa.com