1973 C-10

Can anyone here shed some light on the correct specifications for the CFM rating of the quadrajet carburetor for this particular model?

73 C-10 350 engine

Edelbrock web site states that the oem replacement is 750 CFM and that is the lowest CFM Q series Carb they offer.
So I bought it.......... The truck loads up very badly and fouls the plugs.

I took it to a shop to further diagnose the issue and was told that "No Way is that the correct CFM Carb " for the truck." The mechanic says "it is dumping way too much fuel and cannot be leaned out any further" Everything else checks out ok except that.

Who is right ? I would have thought Edelbrock would be the authority on Carburetion.

The only other reccomendation the mechanic gave was to convert from points & cond. Distributor to HEI Distributor, but he says that wont solve the fule dumping issue.

Im totally Confused now! I want to verify before i buy another new carb and that not fix the problem.

Thanks in advance for any insite on this

the problem with carbs is most techs nowadays don't know how to work on them or even how they work. a quadrajet will flow up to 750cfm. if you like taking stuff apart get a rebuild kit and overhaul your old carb, most kits are cheap $30 or so. if they couldn't lean out the carb by messing with the idle screws it is loading up because something is gummed up and sticking. a sunk float or stuck open metering rod will do this but a rebuild kit will have all these parts.

yeah i have a 73 c-10 with a 350 and i have a holley 600 cfm with vaccum secondaries and even that was way too rich. i had to get smaller main jets and a power valve that opens at lower vaccum levels because of the high flow of the carb. someone told me that 600 is a little high for even a 350 possibly. thats with a stock cam in mine tho, if you have a racing cam it will require a bit more jetting than a stock cam would.

as a comparison to your setup, you said you have a 750 cfm edelbrock carb on a 350 engine that i will assume is stock. a friend of mine has a 454 with a really lopey racing cam that he runs a 600 cfm edelbrock carb on. runs great and will BEAT A 2002 v8 MUSTANG DEAD IN ITS TRACKS. that mother goes so fast that the rear end of the truck starts losing traction and swaying a little from the uplift of air on the underside of the box. that truck is badass with only 600 cfm on a 454. so yeah i would definately sell your edelbrock or trade it for one with a smaller maximum cfm.