Thanks I put them on and they look fine. How much psi would you put in them? You think 20 psi is to much?

It say 50psi max I think that's extreme there's 20 psi in them now and feel solid.
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I'm with Joe.
I would have added a stronger valve spring, and shaved the key way, that adds more compression, which equals more horse power. Pretty simple really.
Most people don't know this, but putting on a taller gasket on the valve cover adds about 30cc's.
That's a great idea. How much do you thing these would add?
I think your smokescreen is interfering with what your reading Joe, were talking tires here.
Bbqjoe, the metal valve caps help but to get maximum HP, I mix my air special. Two days prior to mixing, I have a few good helpings of beans, corn bread and onions. It really makes you blow and go. Mounting the tires upside-down will sometimes help.
Someone FORGOT to take their MEDS......oops, better go take mine..