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Why the 140PSI valves, waaaay to much, IMO. The manifold is normally under vacuum .

I don't think I would want any more then +50 PSI in that intake.



I meant to comment on that....To clarify, I didn't customize his intake, I just offered him the idea. I am also a proponent of a very soft valve, because, as you pointed out, the intake is under vacuum, no need for a high pressure opening valve.