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RR, the only reason you want bare heads is so you can use those 3/8" stem valves you have lying around. correct. Time to move on! cant, budget constraints. 5/16 or 8mm stems have much less mass and don't block the airflow as much. I agree but on this street app I'll be fine .
You'll have more in machining costs to open the guides & install larger ID bronze guides than if you'd bought complete heads... 
"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
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