RE: [Chevelle-List] Carb opinions... Demon? Street Avenger?

[Mark Weber]

For what its worth, I am not very happy with my Street Avenger.  It is a 770 cfm vacuum secondary on a 468 BB.  It installed pretty easy, but the (Holley) carb gasket did not match the (Holley owns them) Weiand intake manifold, I had to trim the gasket and mill some intake manifold to correct that. I can send you a picture if you want.   Efficiency?  Ha. My car has about a 3.08 rear and a TH700 overdrive.  It runs about 2000 rpm at 70mph.  Best I have gotten is about 12mpg on trips.  11 is maybe more like it.   Idle down?  Not all the way.  There is currently an issue where the car will idle down to 1000 rpm by itself (for instance sitting in traffic) and no more.  If I tap the accelerator it will idle down further to 700 or so.  I tried an extra spring on the carb that that got too stiff, maybe the wrong spring, maybe the wrong solution to the problem.   I have not tried to contact Holley for support or advice yet.   That is my experience so far.  Your experience may vary.   Good luck.   Mark 71 SS -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Raj R. Sent: Friday, January 10, 2003 1:51 AM To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Subject: [Chevelle-List] Carb opinions... Demon? Street Avenger? Anyone running a Demon carb or Holley Street Avenger? I'm looking into getting a new carb instead of rebuilding what I got (read: selling what I got to recoup the money for a new relateively hassle-free carb that I can buy and install in the same weekend rather than waiting for a shop...).. Any thoughts?   I want ease of install/use... I hear the Demon carbs work bitchin out of the box (and while I've heard the same about the Edelbrock 1406 I've also heard quite the opposite!) and so far so good with the Street Avenger.. Not too many reviews out there on either carb, though.. Hmph..   Anyway, any info is greatly appreciated :)   Car its being used on (for the email that goes to the Chevelle list.. hehe)   67 Plymouth Barracuda 360ci, 9:1 compression [cast], ported #302 heads (closed combustion chamber.. A swirlport design.. Small valves.. I'm banking on high port velocity..) Edelbrock Performer intake 340 Exhaust Manifolds (a high flowing stock exhaust manifold similar say to the early Z28 manifolds) Electronic distributor conversion with some sort of re-curve.. not sure yet as I have yet to recurve it.. Cam-shaft is a mystery so far.. Only numbers I know-- 228 duration.. (@ 50? don't know.. But, it was a custom grind and I'd know more info if the engine builder and I were on speaking terms.. But after I got an engine minus freeze plugs, push rods, and a 30/30 crank that was still gouged I decided I'd rather not talk with him.. The cam looks decent, though..).. A-904 trans (TCI valve body for nice firm shifts, good quality internals) 3.23 open rear end..   The car is my daily driver and I do commute a decent amount so I'd like to keep fuel economy in some consideration.. I was going to run my Quadra-jet but I'm saving that for my Chevelle for originality.. Plus, rather than spend $250 to have JET re-do my worn out Q-Jet I'll go with a brand new carb..   Or am I sick in the head? :)   Any help is greatly appreciated..   Raj 67 Barracuda Coupe 71 Chevelle SS