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I just did the dual guide conversion...buy 8 new valve guides and have the machine shop take a bit of material off the rocker arm so it sits flush
mazworx will do the machine work if you're worried about getting it right, that's who did mine and they dropped in and i have had zero issues after about 1000 miles and i've driven my car hard...i dont bounce it off the rev limiter, but i have taken it past 7500+rpms w/ zero issues. I also removed the rocker arm stoppers when i did the conversion.
this was on stock springs/retainers/cams so the new guides dropped right in.
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