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Tom Meyer · 02-01-2019, 08:39 PM

There are guys running check valves from power brake units instead of the pcv valves. Its a poor mans vacuum pump. was always told if you could keep some vacuum in the crankcase say 3 in it would free up some power. Remember for all the air that is moving on top of the piston there is air moving below it also. Back in the day they said it helped ring flutter. But with todays ring combos who knows. Tom

02-01-2019, 08:39 PM	#19
Tom Meyer Senior Member Join Date: Aug 2003 Location: Pierce NE Posts: 934 Likes: 75 Liked 351 Times in 120 Posts	Re: Adjustable PCV Valve There are guys running check valves from power brake units instead of the pcv valves. Its a poor mans vacuum pump. was always told if you could keep some vacuum in the crankcase say 3 in it would free up some power. Remember for all the air that is moving on top of the piston there is air moving below it also. Back in the day they said it helped ring flutter. But with todays ring combos who knows. Tom __________________ Tom Meyer 5240 SS Stock ???