I ran my old pt54 up to 30 psi with unported heads. My trap speeds were just short of 120 (I think it was around 119.7 or so.) The car picked up 3 mph from 26 psi to 30 psi if I remember correctly.
Well I'm thinking that I was only running 24-25#. So what would it do with another 3 or 4 more pounds? I've got Cometics now so I should be able to push a little bit more out of it. :biggrin: