I have had my Twisted Wedge heads for at least 5 years. My Mustang is a trailer car and I don't have many miles but 5 years is a long time too. Several of my valve guides wore out. I know there was a problem with guides in these heads way back when but at the time I had no problem so I kept on running. I recently took my heads off and noticed several of the valves too loose to go back together. I call Trick Flow and talked to Charlie. Although my heads are this old he still sent me all new guides and even stem seals at no charge. I believe this says well of Trick Flow. Many thanks!
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88 347, Twisted wedge heads,Comp Cams 224/230 cam, 1/4=10.718 @ 123.02 mph dyno=
http://www.fbody.com/members/LarryS/mustdyno.jpg
[This message has been edited by 8850 (edited 03-24-2001).]