[fxbill]

Hi Tony,
Mine was a mechanical secondary. I've also run a Holley 830CFM double pumper and a Holley Avenger 770CFM on the same engine. No, I did not feel any difference between the Demon and the Holley. As far as I'm concerned they're the same carb. The Avenger was $100 less but with vacuum secondaries and you WILL notice a difference between a double pumper and one with vacuum secondaries although for street driving they're fine. I had problems getting the secondaries to open quick enough with the Avenger even with the lightest spring supplied with the carb. Although it ran smoothly and worked well right out of the box the 1407 Edelbrock kicks it's butt and there's a seat of the pants difference between the two. I sold both the Demon and the Avenger on Ebay recently and stuck with the Edelbrock. The nicest thing about the two that I sold is that they bring decent money on Ebay! The Edelbrock sells for $175 rebuilt from Edelbrock and there's sure not $250 performance difference between them. Not trying to sway you from what you want, but the 1407 outperforms them all on my engine...