I noticed that Holley just came out with a new line of carbs called the avenger series. Are there any people using them yet? Are they comparable to Demon carbs? I was thinking of a 625Road Demon, 650cfm Street Demon or a 670cfm Holley Avenger. For a ZZ4 cammed, 9.5 to 1, 350CI, Dual plane, TES, ported headed smallblock. Any suggestions?

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92fb currently a TBI 305, (hold the laughter to a minimum). Going to be a 350 carb with 350HP and 400FT/Lbs.

 

Does anyone have any info on what exactly sets the Avenger apart from standard Holleys? I was reading a little bit on it, and it looks like it has alot of "easily tunable" features on it, but I wonder if it is really much different than the standard holleys... The add didn't really explain what made these "features" any different from regular.

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Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray

 

I'm currently useing the 670 HOLLEY Street
Avenger and First it's not ready to run out of the box.I had to set choke,float level,and
vac. secondary spring. The special features of clear site plugs,Quick change vac. secondary,etc,dont make the carb worth it's hefty price tag.By the way looking to trade
it for a 650 dbl pumper.It has about 200 miles on it.

 

the power of advertising can suck you right in if you let it. same old holley carb in a brand new package. how can you sell a carb out of the box ready for a million different engine combos. you can't. same goes for demons.

 

Okay, once more:
Some is GOOD
More is BETTER
Too Much is JUST ENOUGH!
If you are building your engine for torque go with the smaller carb. You want HP go with a larger carb. If you are using a dual plane with a dividing wall in it then you can go with a bigger carb and still maintain adequate vacuum signal for the larger carb. If you have a standard tranny you can definitely go to a larger carb. If you have an automatic with the stock converter stick to the smaller carb. If you have an automatic with a high stall converter go with the larger carb.
Basically all of the formulas you see figuring what size carb you need are going to tell you too small of a carb. Don't waste your money on a double pumper unless you are going to do a lot of racing or your idea of going to the corner store involves making the trip 1/4 mile at a time. I had a 650 double pumper and a 750 vacuum secondary carb and the 750 worked better on a built up 351C (yeah that's a Ford motor, I learned!). The 650 double pumper was a custom carb from Barry Grant that they told me was perfect for my combination. They were wrong, the car was 2/10th's faster with the 750.

 

I think I'll go with the 625cfm Road Demon, thanks.

 

Thanks Flash for the info. I started out with a Edelbrock 750 but had nothing but trouble with it.Went with Holley MUCH better.
The only reason I was looking towards a Dbl. pumper was a article in Hot Rod mag.They did a buildup same overbore same cam same heads
intake etc.as mine, and they used the dbl. pmp. dyno'ed it made jet changes and I was going to let there work,work for me.Same carb Same jet change.And the carb was going to be for track duty only.I know the dbl.pmp
carb is no daily driver carb by any means.Thanks again Flash.
Bill