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Discussion Starter · #1 · (Edited)
I currently am running a 1963 9 bolt head on my 800cc Routts. Intake valves are 1.60 but exhaust are 1.34. I believe the Exhausts were increased to 1.44 on later model 650 and the 750. Since I have the head off and doing some valve replacement, would it be worthwhile to consider increasing the exhaust to 1.44 and if so is that costly?
 
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