Use Kroil instead of WD-40, and heat the stud and the manifold area red hot before you even try to remove them. Once the stud moves, work it back and forth a little at a time. If it gets even slightly sticky, use more heat!
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!