Runs better on Hi test

webbers1972 Pantera, Restored. How do I put pic on here?

I have a 72 pantera. My notor is a 30 over 351C. I have trw forged dished pistons and Open chamber heads on. I put Closed Chambered Heads on for more hp. Now I need Hi test, Because it runs way better with it. Why? I use Sunoco 93 plus. My cam is 588lift, Dur, 310. carb a 780 Vac. WHen I stop she wants tp conk out. Then I rev it and black smoke come out a little, But runs go when I take off. Any suggestionsd on the Carb?

6/1/079:41 AM

Original Post

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