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Message: [QUOTE="Zeb, post: 1528406, member: 30304"] Drive pressure is a moot point when it comes to valve float on a turbo motor. Think of it this way, even if you’ve got 80 psi drive pressure on the exhaust stroke, you’ve got the piston coming up and that is creating significantly more pressure below the valve (trying to force it closed) than there is drive pressure trying to hold it open. Rpm is a bigger factor because a weak/low pressure spring reacts slower. [/QUOTE]

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