I'm buying a set for a low $$$ mostly stock carbed 5.9 Magnum with a Hughes Whiplash cam. I ordered an "old" Whiplash grind that doesn't require machining the heads for bigger springs.

Hughes claims that the Engine Quest valve guides will cause problems unless you buy a set from Hughes with their replacement bronze guides.

Has anyone had issues with these heads out-of-the-box? shruggy

Last edited by 300by500; 05/31/17 04:51 PM.
https://i.imgur.com/tmuGzov.jpg