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10-06-2005 06:19 PM #1
CHR Member
- Join Date
- Aug 2004
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- clive
- Car Year, Make, Model: BLOWN 540 57 CHEVY
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- 2,878
Choose A Cam By Head Flow Rates.
If we know the given flow rates for a set of heads.How do we pick a cam then?I understand the exhaust port flowing say 75% or 80% of the intake port is great but what if we want to run N20. or a blower.If the exhaust does not flow where we want it to then can we try and hold the exhaust valve open a few more degree's at .050 to compensate for this .I guess my question is how much longer can a person hold the valve open without blowing it all out the exhaust side.Is there a formula out there to determin this.I do know some of the cam makers ask for the flow rates in picking out the cam.Yes I know dyno time would tell me this. But how do the cam makers make their guess ?Last edited by erik erikson; 10-06-2005 at 06:40 PM.
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I believe this was somewhere around 2015, Rick, Rosie and Johnboy
John Norton aka johnboy