Apparently the older heads had some valve guide problems, but Trick Flow fixed them for free. Since then I haven't heard anything bad. I've had mine for 3 years now with no problems, but thats only about 6000 miles.
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Good luck!
Brad R.
1992 L.X. 5.0 coupe
MODS: A few little bolt ons 
New Best time ...11.60 @ 128 mph @ 2000+ ft altitude.
Rice Haters Club member #39
Users rides #2542
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