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I have a 434 sbc with nitrous...alot of nitrous 450hp worth. I am not running a relief valve using my Moroso 3 vane pump. How much is this hurting me?
4" pump pulley, 2.5" crank pulley
 

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Keep an eye on your oil pressure. You can get to a point where there's so much vacuum that you will start to lose oil pressure. I would determine how much you are drawing at least with a gauge and better yet a logger.
 

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"Darkness"
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Bet you are not making more than 10 psi.
 

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X2.

The three vane pumps don't pull enough vacuum to really worry about it...even on a wet sump motor. Maybe 8 inches through the lights? Idle vacuum will be low as well. Put a gauge on it to double check.
 
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