At what point would you step up to ferrea hollow stem valves

rumblefish360 said

Thanks killer6. I was having a Brain fart last night on there length.
Longer is heavier, but all so worth it.

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I installed longer 5/16 valves in my econo heads. The rocker stands were machined off when I bought the blown motor but had short valves. I am using T&D rockers.