Thread: carburetors

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alright help me decide on a new carb.
right now i have a holley 80508s which is a 4160 dual feed Vacuum secondary carb 750cfm. Im looking at the 650 Speed Demon or and Edelbrock 1806 AVS thunder series. Im just getting tired of the Holley having to tune the thing all the time and the bad exhuast smell and leaks. I just fixed a gas leak from the base plate today. I had to fix the same leak last year too. Im beging to think that the Holley is too big for my motor.
my motor specs are
355
9.5:1 comp
218/228 @.050 .520 lift
Vortec heads with 2.02/1.6 valves
professional products Crosswind (Just like RPM Air Gap) squarebore
Accel HEI Super Coil
Trans is a th400 with a 3.08 rear

Thanks for the Help.

I am partial to Edelbrocks for good street manners, so I would steer you in that direction. If you decide to purchase an Edelbrock carb, I would advise you to purchase a tuning kit with metering rods and jets along with it so you can dial it in. In my experience, these carbs are a little rich out of the box.

The Edelbrock carbs seem to be almost trouble free from what I've seen

Originally Posted by Daffy427

The Edelbrock carbs seem to be almost trouble free from what I've seen

As long as you don't have to adjust the floats.

I like Edlebrock carbs. The body gasket is above the fuel line. Lots of good tech help. If you want something different Demon or Barry Grant. Check out the Edlebrock web site for size of carb size. It is a common problem along with too much fuel pressure.

I like Edlebrock carbs. The body gasket is above the fuel line. Lots of good tech help. If you want something different Demon or Barry Grant. Check out the Edlebrock web site for size of carb size. It is a common problem along with too much fuel pressure.

A 750 with vacuum secondaries is not too big for a 350 if you're looking for max power. Heatwave touched on the most prevalent problem, excessive fuel pressure. You don't need more than 5 psi on ANY carburetor.

THIS AIN'T FUEL INJECTION GUYS. MORE FUEL PRESSURE DOES NOT EQUATE TO MORE POWER WITH A CARB. IT JUST MEANS INSURMOUNTABLE TUNING PROBLEMS UNTIL YOU GET THE PRESSURE UNDER CONTROL.

5 psi....5 psi....5 psi....5 psi....5 psi....5 psi....5 psi....5 psi

edlebrock all the way .. no leaks .. easy to adjust .. get the electric choke though .. the manual is to finnacky ..

Rather than buy the full-on tuning kit which has a lot of parts you won't use, I suggest getting the metering rod spring kit and match rod actuation with your camshafts vacuum levels.

Then, if you think you need different rods and jets, consult the Edelbrock tuning manual.

Go here and scroll down: http://www.edelbrock.com/automotive_...ess_main.shtml

The information Edelbrock supplies will be pretty much right on the money.

Heed Tech's words about fuel pressure as well.