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I read that stock valves start floating at about 7500rpm, at which point you get improper sealing and lost compression because the air/fuel mixture is burning and squirting past the valve before it closes. Closer to 8000rpm you're playing with pistons hitting the valves. I was contemplating this upgrade when I was rebuilding my engine. I decided against it because when I looked into get the stiffer JWT valve springs to safely have the higher redline, I saw that I'd have to upgrade the valve retainers, valve guides, something else I can't remember, and then someone said that solid lifters should be considered for revving to 8000 too. It was like $1500 for all of it, so I decided to leave everything alone :) But best of luck, I hope to do an NA rear some day. I think you can have quite a beast :) Kez
 "Pulled the blower fan down from behind the glovebox and there was a mouse nest inside the cage fan - mom and 6 babies. Mom was dead and the reason for the smell - petrifying fast - but the babies were hanging on. At least until I fed them to the cats." [ZXtaZTT - June 19, 2002] |
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