Demon 650 vs Holley
 

Has anyone had experience stepping up from a standard 650 holley to a Speed Demon 650?

Anyone know of a dyno test done to justify spending the extra money?

Any info would be appreciated. Thanks.

5.0 Magazine and MM&FF (don't have months, sorry) have both done comparison tests using Demons and Holleys. The Demons always come out on top....usually by around 10hp or so.

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1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

Unless you're going to do some all out drag racing, go with the Demon. But if this is your daily driver then stick with the Holley. I seen guys at the strip put in a Demon, run a few test runs and end up taking it back off and running their Holleys. Unless you really have one heck of a motor stay with the Holley. The Holley double-pumpers are a big gain over the Holley vacuum secondary carbs even though the cfm's are the same. Been there, done that. Have fun.