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Installing 2.5-5.3 Heads and a Magic Stick 3 next weekend and have 146,000 on the odometer. Buddy of mine has a Vindicator with Trickflow Heads (full race setup) with 150,000+ on his. I would say 55k would be ok
i had a cam installed at 167k miles a few months ago and next week my trick flow heads go on at 170k. Car pulls strong and doesnt burn any oil, I'd say do it!!!