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Message: <blockquote data-quote="Burninrock24" data-source="post: 1160350" data-attributes="member: 18179">This is the best headswap write up I know of: <a href="http://www.allfordmustangs.com/forums/4-6l-tech/160636-pi-swap-write-up-1996-mustang-gt.html" target="_blank">http://www.allfordmustangs.com/forums/4-6l-tech/160636-pi-swap-write-up-1996-mustang-gt.html</a>Bring them to a machinist to see if they are within tolerance. If they are, then leave them be. If they aren't then get them milled back to the max tolerance and use a thicker gasket. These mod motors are way too picky with the tolerances that they like to be in. Porting is iffy. The modular motors have a completely different porting strategy than what most head porters are used to with pushrod motors. So make sure that the porter has experience with mod heads before doing it. Also, make sure to set aside money for a tune. You are changing pretty much every parameter that the stock tune is used to. Canned tunes won't compensate for the change either. So safely expect to pay $400-600 for Dyno time depending on if you own a tuner already</blockquote>