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affect of valve stem on air flow #855161 11/16/10 11:50 AM 11/16/10 11:50 AM
Joined: Jan 2006 Posts: 53 New Jersey barryc OP member
barryc OP member Joined: Jan 2006 Posts: 53 New Jersey	Is there a way to figure out what affect the diameter of a valve stem would have on air flow? Currently have 3/8 valves and thinking of going to a 5/16 stem. 6304184-challenger2.jpg (82 downloads)

Re: affect of valve stem on air flow [Re: barryc] #855162 11/16/10 12:54 PM 11/16/10 12:54 PM
Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually B BradH Taking time off to work on my car
BradH Taking time off to work on my car B Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually	I can tell you that changing from "waisted" 3/8" to "waisted" 11/32" was good for 1-2 cfm (max) on a set of my old heads that were converted to narrower valve stems.

Re: affect of valve stem on air flow [Re: BradH] #855163 11/16/10 01:11 PM 11/16/10 01:11 PM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	valve itself should be lighter

Re: affect of valve stem on air flow [Re: ademon] #855164 11/16/10 03:47 PM 11/16/10 03:47 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: valve itself should be lighter Ya, I think the big gain is weight reduction for a more stable valve train operation at high rpm"s. Fastest 300

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