dans82bird

argh... I am in need of a exploded diagram for an old Quadrajet - 7042208 QC. I am putting it on my car.. the thing was in pieces when I got it and I got a BorgWarner rebuild kit but there is no diagram on it.. just specifications like float height... etc. maybe someone can tell me how to set the float height and all that... I am just really familiar with holley's, this is new to me :lala:

Thanks,
Dan

Apeiron

One of the best sources of information you'll find on the Quadrajet (and Rochester carbs in general) is "Rochester Carburetors" by Doug Roe, published by HPBooks.

dans82bird

would you happen to have a scan of it? specifically the side where all the choke linkage bolts up... i've got the whole thing figured out except this one little lever... I think its for the secondaries or something odd..

dans82bird

Nevermind... I got the view I needed, courtesy of carbs.net I spent like 4 hours looking on the 'net for stuff last night over at my buddies house and now I sit down for 2 minutes and the first site I look at has the information!

On a side note... It seems someone has had this thing apart and epoxied these 2 'things' on the bottom in the middle... is this a common leaking place on these things? I peeled the old epoxy off and put some jbweld on AND finally does anyone have an article about tuning these things... it seems like its some kind of 'black art' or something :lala: :lala: :lala:

RB83L69

Go follow the above advice and buy the Doug Roe book, it's worth every penny.... you'll make it back in your first week's gas bill.

If the parts that they epoxied are 2 large plugs about the size of a dime, it is a waste of time and materials. Those are the secondary metering well plugs, which rarely leak; and even if they do, there's a gasket there, that will hold the fuel in place. The plugs that actually matter are the ones under the primary jets, 4 of them, much much smaller, on what looks like 2 irregularly-shaped "towers" when you turn the fuel bowl upside-down. Those should be wire-brushed and sanded down to clean metal, and epoxied over.

Incidentally, JB Weld is simply a brand of epoxy, nothing special about it. Those aren't 2 different things, like (for example) epoxy and silicone are.

That's a terrible carb core for a performance application. It's off of a 72 350, probably a full-size sedan or wagon, early smogger core. I usually throw those away and get a pre-smog core if at all possible. Good luck.