Demon 650 vs Holley

mikew88gt · 01-06-2001, 08:29 AM

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.

84_GT350 · 01-06-2001, 03:52 PM

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

pro88 · 01-07-2001, 05:14 PM

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.

01-06-2001, 08:29 AM	#1
mikew88gt Registered Member Join Date: Jul 1999 Location: New York State Posts: 242	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.

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01-06-2001, 03:52 PM	#2
84_GT350 Registered Member Join Date: Apr 1999 Location: Overland Park, KS, USA Posts: 1,631	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. ------------------ 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

01-07-2001, 05:14 PM	#3
pro88 Registered Member Join Date: Dec 2000 Location: roseburg, oregon Posts: 87	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.