I just got my 351W installed with the JBA shorty headers. Many of you know that they contact the passenger side inner fender just barely when using them with a 351W. Others have posted that they had problems massaging the inner fender well with a hammer with the engine installed. I have the solution. With everything in, I just used a porta-power hydraulic spreader placed hear the contact point against the header and the inner fender well. Gently moved the inner fender perfectly without damaging the header at all since the fender is so much thinner. It looks like it was made that way.