hello...Larry, I have always used epoxy with my heads-here is key!!!!! you can shape port and use epoxy around plates and extend center of "point" on plate -this is KEY to getting bigger intake flow #'s- and yes it works and STAYS put-my 292 daily driver Chevy 3/4 ton has has a head like this for over 3 yrs now with no problem with expoy-.....when you flow a head only with plate- then use expoxy to contour port, you add manyyyy cfm's with expoxy .....
Lee
