Mar 17, 2007 #1 S StevenT New Member Joined Nov 23, 2003 Messages 4 Anything to be gained by back cutting the stock 109 exhaust valve on a ported stock head? Thanks!
Mar 18, 2007 #2 K knperformance knperformance Joined May 4, 2006 Messages 43 back cut valves With flow bench testing a stock back cut valve shows fantastic improvements almost as good as an aftermarket valve up to .500 lift.
back cut valves With flow bench testing a stock back cut valve shows fantastic improvements almost as good as an aftermarket valve up to .500 lift.