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No Vacuum at lower RPM (RB25DET NEO)

DTT_Eruc

By DTT_Eruc,
in Engines & Forced Induction

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DTT_Eruc Enthusiast

DTT_Eruc

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Is it possible that tight valve clearance on the exhaust side can cause little to no vacuum on idle...... This is regards to a RB25DET NEO i got...Re done the head installing tomei 1.2 head gasket and lapp over the valves however after that was done the intake side was at nissan specs of 0.012 and the exhaust is way tighter(0.014 to 0.015) on all 12 of the exhaust... will this cause such issue... secondly my last chance was to check to see if my timing was off

Running tomei poncams 260 9.15 Intake and 262 9.15 Exhaust

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https://www.sau.com.au/forums/topic/478247-no-vacuum-at-lower-rpm-rb25det-neo/
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