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Discussion Starter #1
have a 99 with a eaton m 90 will be a kenbell someday but rebuilding after a spun rod used a mmr 900 kit bottom end ported heads cam's is it worth it to get bigger valves why i am in it, what kinda power gain's from the bigger valves and looking at equal length headders, question is the power gains much sense im forcing air anyways instead of n/a?
 

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i would not run larger valves. stock size ss valves are nice cause they dont have a lip on the bottom so you get a little more clearence for larger cams. as it sits now the stock valves sit real close to the outside edge and running larger valves perform better with a 30 over bore.
 

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Discussion Starter #4
why long tubes? and im not worried about ptvc i have fly cut pistions i will check it when assembling of course but just wondering if head flow increasses much with larger valves
 
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