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Zimmy:
Don't know much with regard to the short v. long velo stack differences. Phil Remington told me that when he was working at Hilborn Injection, as Chief Engineer, back in the fifties, the prevailing thought was that a most of the air entering the air horns from the top was via the front scoop. They found out later that much of it was coming from the bottom of the engine compartment. The radiused (tulip) velo stack worked the best, as the air would follow the contour of the radius. If the traditional stack, which has a sharp edge, was used, the air would break away once it hit the leading edge of the stack. That's why you will see the Scarab cars with the radiused stacks.
Regarding the backfiring issue, I would suspect an exhaust leak.
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