General Category > Quadrajet Carb Talk and Tips
Divorced choke and headers
bob69:
I'm having problems with the divorced choke on my SBC. I recently installed headers on the engine. The choke takes about 10 - 15 minutes to come off. Before the change the choke took no more than 3 minutes (winter time) to come off. I figured removing the heat riser is why.
I'm hoping someone has solved this problem without having to change to a later model q-jet. I would like to keep the original 7029202 DH, E9 date code carb.
quadrajam:
I also think it may be the lack of crossover heat if nothing else changed.
Here,s an easy way to verify it. With the engine cold, slide a square block
of wood into one exhaust pipe. Use a pair of vice grips clamped onto
the edge of the exhaust to keep the block from blowing out. Start it up and
see if your back to the 3 minute warm up. Some people have also shoved a
potatoe in one pipe to test.
Cliff Ruggles:
I've never seen that dramatic of a change and we frequently removed the heat riser or locked them open and not much change doing that either.
I'm not a big fan of headers on anything street driven unless it's a "weekend warrior" or "max effort" set-up. Like most other "high performance" items you purchase gains are not nearly what we are led to believe and they never tell you about all the negatives associated with the "upgrade".
Even the best made headers will blow out gaskets, burn up your plug wires and cook the starter on long runs unless steps are taken to prevent all that.
Matter of fact all the SBC powered vehicles that I purchased that already had headers were converted back to manifolds for the reasons above........
bob69:
I appreciate the input. I'd rather fix the choke problem than go back to the stock exhaust. After all, the headers are on and the money's been spent. I could use a later model q-jet and convert to an electric choke, but want to keep the original date coded carb.
I was checking other forums and read several write ups on after market electric chokes to replace divorced chokes. Does anyone have experience with these?
77cruiser:
I've never tried on e of these setups, but I don't see why they wouldn't work.
https://quadrajetparts.com/electronic-choke-conversion-chevrolet-1965-4bbl-carbu-p-2638.html
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