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yeah, you will not noticed any large power differences in +1mm ovesized valves unless your making some serious serious power, like the other guy said, a good porting and polishing job w/ a nice 3 or 5 angle valve job will yeid you more noticeable power than just adding +1mm oversized valves. hope this helps
According to Slow Boy you will actually flow better with stock size valves than oversize valves on an otherwise stock flowing head. It will take a good amount of head work to make oversize valves worth it.
This question never got answered and not trying to thread jack, more adding to it anyway when running o/s valves would their be more lag. Just like running a large smim or
T.b., fmic ect it takes a bit away down low but give back up high is it the same or with proper p&p no matter the turbo ect. You'd just see gains. I understand that it's been said with out p&p, opening the throat, ect you'd get more from std size but what if u did yhe head work properly but
were only running a 16g would u just see gains all the way through. I'm running a 20g now but plan to go bigger (biggest 35r scale) so if all things the same if heads done right getting o/s would be good idea
some consideration can be taken into having the valves unshrouded, (modifying the area in the combustion chamber, around the valves) when switching to oversized valves. As it will affect the size of the chamber This isnt favorable for guys who are looking the most compression possible.
Make sure the shop installing the valves knows how to do a proper valve job. Too often I see heads with oversize valves on a standard size seat. All this does is kill the flow and make the head perform worse than stock. Make sure they enlarge the seat using a Serdi type machine. When done properly you will see an improvement in airflow.