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Madmax305 09-02-2012 03:53 PM

Which Carb?
Help me decide which carb for my set-up. I have a 1967 el camino with a th350, 4.10 gears, 3000 stall, 350sbc. It has about 9.2 compression, RHS 64cc vortec heads, LT headers, msd pro billet HEI dist and a comp magnum 286h flat tappet cam. I have been having problems with my Holley street avenger 670 vac sec carb. I would like some suggestions on which Edelbrock carb to buy. The carb will need vac secondaries and electric choke. The performer series 600 or 750cfm or the Thunder series 650cfm? This is a street cruising car only, no track time.

scott420p 09-02-2012 03:58 PM

I have run the 750 edelbrock on an s10 with a th350 3.89 a 3000 stall, 202 160 461 camel humps hei and a very similar cam with absolutely no problems. I actually had to upgrade from the 600 edelbrock. The edelbrocks are pretty simple to tune also.

Madmax305 09-03-2012 08:04 AM

Are there any problems with these carbs and Lopey cams? Will there need to be additional adjustments to the carb to get it to run right with high lift/duration cams?

cdminter59 09-03-2012 10:10 AM

which carb
Adjust your initial timing so you don't use the carburetor's curb idle screw to open the throttle plates to far to uncover the idle transfer slots. Start with around 16* initial timing to get the engine to idle around 950 rpms. If you don't get instructions with your carburetor go to Edelbrock's website for tuning instructions. You will need a vacuum gauge to tune the carburetor. Before installing the carburetor adjust the idle transfer slots to about .020. Here is the technical data on tuning your Holley 670 Street Avenger . Doesn't matter which carburetor you have both will have to be tune to your engine.

Madmax305 09-12-2012 09:49 AM

Thank you for the replies...Update, I have ordered an Edelbrock 800 thunder series carb and a custum set of 10* and 14* bushings for the MSD dizzy, ($33 for the two bushing, WOW). I will keep everybody posted on the progress....:)

Madmax305 09-15-2012 02:53 PM

OK, I put the new Edelbrock 650 carb on and installed the new 10* advance bushing in the MSD distributor. I tried to adjust the base to 24-26* but the starter bucks and I can't get the motor to take that much base timing. The most I can get is about 16-18* before the starter bucks and will not crank the engine fast enough to start it...

Any other options? What about hooking up to the manifold vacuum vs ported vacuum to help add 10-12* to the base. Would this help me achieve the 24-26* initial timing? :confused:

Madmax305 09-15-2012 03:12 PM


Originally Posted by F-BIRD'88 (Post 1590995)
Fix the starter first (heat shield, remote ford solenoid, battery, cables ground)
Then install the interupt switch. its easy. make sure the OEM starter brace is installed.

OK, I already have the remote ford solenoid installed, I have the oem starter brace, I will install that. What is the interupter switch?

LEROYDOZOIS 09-15-2012 05:42 PM

it seems like
you cant go wrong with an eddlebrock carb, and as long as you follow every step of their instructions as how to tune them for the purpose they are easy to tune, i had the worse time trying to get my cruise set correctly and not dumping 12-13 afr out the pipes, all because i used an open spacer, #2 on the installation instructions says to NOT use an open adapter:smash: aaaaaaaand now i see why lol =]

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