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Tech Talk => Engine Mechanical / Electrical => Topic started by: Ckaz21 on June 11, 2014, 05:07:40 PM

Title: Holley vs Speed Demon
Post by: Ckaz21 on June 11, 2014, 05:07:40 PM

Hey guys I'm deciding between a holley model 0-4781s 850 double pumper and a Speed Demon 850 double pumper. I like the looks of the demon but if the holley out performs it than I'll go holley. Any thoughts?

Engine:

454 .030, 9.5 compression, comp xm278 cam, 049 heads with 2.19 and 1.88 valves. Edelbrock air-gap intake.

Thanks!


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Title: Re: Holley vs Speed Demon
Post by: jyeager on June 11, 2014, 05:19:42 PM

Quote from: Ckaz21 on June 11, 2014, 05:07:40 PM

Hey guys I'm deciding between a holley model 0-4781s 850 double pumper and a Speed Demon 850 double pumper. I like the looks of the demon but if the holley out performs it than I'll go holley. Any thoughts?

Engine:

454 .030, 9.5 compression, comp xm278 cam, 049 heads with 2.19 and 1.88 valves. Edelbrock air-gap intake.

Thanks!


Sent from my iPhone using SoCal Jet Boats

ive always used holley carbs. nothing against demons. its a preference thing.

Title: Re: Holley vs Speed Demon
Post by: beerjet on June 11, 2014, 05:24:27 PM

The adjustability in the demon is way more than most will ever need.
I loved mine.
Not a bad choice but they are basically the same.

-beerjet-

Title: Re: Holley vs Speed Demon
Post by: Cliffjumper on June 12, 2014, 12:15:43 PM

All a demon is is a sleek looking  barry grant holley

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Title: Re: Holley vs Speed Demon
Post by: 86caribbean on June 12, 2014, 01:56:19 PM

I have tested and run both on dyno's, the Holley's always seems to produce more HP. We have always had good numbers with the Holley Pro Form's. Funny, even years ago when Barry Grant ran a pro stock car, he was still using Holley Dominators...LOL :P

Title: Re: Holley vs Speed Demon
Post by: ka0tyk on June 12, 2014, 02:10:18 PM

i have a speed demon, got a great deal on it.  if i were to do it again id get a regular ol 4150 holley.  parts are easier to find, etc. 

Title: Re: Holley vs Speed Demon
Post by: Ckaz21 on June 12, 2014, 05:49:17 PM

Damn I love the look of the speed demon but practicality wise it seems like I better go with holley.


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Title: Re: Holley vs Speed Demon
Post by: Squirrel Master on June 12, 2014, 08:54:47 PM

Quote from: 86caribbean on June 12, 2014, 01:56:19 PM

I have tested and run both on dyno's, the Holley's always seems to produce more HP. We have always had good numbers with the Holley Pro Form's. Funny, even years ago when Barry Grant ran a pro stock car, he was still using Holley Dominators...LOL :P

X2 my buddy races circle track and he bought a demon after having a willys carb which is the Holly pro form just with different metering blocks but the Holly Pro form he said he noticed a drastic change a loss of horsepower after he went demon verses the high-performance Holly series