GODCHSR Posted January 1, 2008 Share Posted January 1, 2008 +1mm oversized valves will fit the stock seats BUT do you actually gain the performance of using oversized valves if the seats are the same size? That's probably a catch all question, concerning all motors... but when I put the OS valves in my Jetta they had to be reseated to accomodate th larger valve... It seems to me that if the valve is bigger you won't actually gain much CFM without the actually seat being larger as well. I must be confused, straighten me out here guys. Quote Link to comment Share on other sites More sharing options...
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