General Category > Quadrajet Carb Talk and Tips

7029207 (1686)

<< < (2/3) > >>

Cliff Ruggles:
I don't recomend running a low float level.  This changes the metering of the carburetor at every point.  Run the correct float level, pressure test the main casting to make sure the bottom plugs are not leaking, and eliminate the hot exhaust gasses under the carburetor. 

Making a slightly thicker steel plate/correct gasket to seal off the channel, then run the later style thick gasket on the plate as an insulator.  This is the easiest and best set-up/repair that I know of for the early intakes......Cliff

Michael9040:
Thanks again, Cliff.  So you are wanting the steel gasket on the manifold with the thick gasket over it (under carb)?  Since this is the reverse of the normal setup I just want to make sure.  I have read about tapping out the transfer holes and capping with 1/4" pipe plugs (someone even used 7/16" freeze plugs).  These methods would be a lot more practical for me than removing the manifold and having the channel filled and machined.

von:
This sounds redneckish but I did this years ago on both my Chevys, one BB and one SB and both are holding up just fine. I wadded up alum foil into a ball slightly larger than the hole diameter and stuffed down into both holes in the intake about 1/2" to the top. Then put JB Weld on top of the foil to the carb gasket surface. After the epoxy cured a couple hours I trimmed it off flush with a razor blade. Then I just used a std gasket between intake and carb. Worked for me.

Cliff Ruggles:
Block the heat supply holes on either end of the channel.  It's best to remove the intake and tap them for plugs, but tapered plugs can be driven into the holes without removing the intake.  I've made many of them from brass or aluminum bar stock.

Install the correct stock gasket.

Make a THICKER steel plate same size/shape as the original.  In only needs to be from a peice of flat aluminum (easier to work with) or steel plate, 1/8" thick is PLENTY.

Install the later thick gasket as used from 1970 and up for most Chevy applications. 

You may have to make a longer choke rod, or bend the stock one to compensate for the higher carburetor height, but this is the best/easiest repair that I know of for those set-ups.....Cliff

Michael9040:
OK......I plugged the holes in the manifold and adjusted the float (it was way too high).  That seemed to have cured all the problems.  But now I find that I have no vacuum at the port for the distributor.  I have 20in if I take a reading elsewhere on the manifold.  I assumed that I had a leak at the carb, but I can't find it.  What have I done wrong now?

Navigation

[0] Message Index

[#] Next page

[*] Previous page