Does anyone know what upgrades are avalible for my Hp500 efi engine, Pat, I think you mention some before when I was planning to do somthing to my Vortech 496. I need 600 to 650hp is this possible?

Eddie

Yes it is, JC Performance and Richie Zul have some 500's that are putting out 640 and run and idle great. My 500's will be back from JC in about a week, should be just over 600-625.

Oh Yes, 600HP for your 500EFI is vary doable...
If you want 650+HP then you may have to go for a 540 cube stroker kit.
Darby in Texas has a 700HP/ 540cube EFI that has the same AZ Speed Intake as your 500EFI.
I would consult with Tyler Crocket and Mark at Precision EFI.
Sounds like a great project!
Good Luck at the race!