Quote:
Originally Posted by Dessertrunner
High Bob,
After looking at the intake valves I think there is stuff all to gain from that change. So you are right the outlet valves need some attentation.
Is there some sort of ratio on airflows relationship between inlet & outlet sizes?
Tony
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Yes, I have found that the exhaust should generally flow 75% to 80% of the intake to be able to make the power the intake ports can support.
As is, the SVX heads only flow 65% at .450" valve lift. So they respond well to exhaust porting and to a more aggressive exhaust cam profile.