800CFM Quadrajet
 

Ok I am looking at replacing my stock quadrajet on my MK IV 502MAG with an 800CFM quadrajet. This is also a marine version. This is what I was told would come in the carb 75 main jet, 52k primary and DA secondary rods. Can any of the carb people out there tell me if this is a good set-up?? The price is reasonable $270.00. If this is not the proper metering rods and jets for a 502 I would appreciate your input on what would be correct. Thanks for the help.

Re: 800CFM Quadrajet
 

Do they actually make a 800cfm Q-jet? I thought they topped out at 750cfm...

Re: 800CFM Quadrajet
 

Yes I think that they might be "worked over" 750 cfm models. Not sure though because I was just looking at the Edelbrock site and they advertise an 850cfm quadrajet. Also they made a 795cfm for GM truck applications back in the day.

Re: 800CFM Quadrajet
 

Cord,yes,there were (2)different quadrajets,the difference was in dia of primary butterflys. Very few motors got the larger one from the factory.TMthunder-call brad urban at "the carburetor shop" in Ontario california(he might be long gone) but if you can get a hold of him he could tell you what sizes you need. I had one of these carbs once but i just can't remember what came in it,Smitty

Re: 800CFM Quadrajet
 

The last time that I talked to Brad, he said that they had gotten out of the Q-jet business. He told me that they found they were actually creating more problems by modifying them then they were trying to solve.

Re: 800CFM Quadrajet
 

I figured the carb shop was supposed to be the q-jet experts so they could give him some place to start with his jetting(i might be behind a few years!!) Smitty