69 327 rochester 2GV carb non electric choke adjustment - Team Camaro Tech
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post #1 of 8 (permalink) Old Oct 18th, 09, 11:50 AM Thread Starter
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69 327 rochester 2GV carb non electric choke adjustment

Does this original style have any way to test or adjustment? Also what causes the carb to go moto the fast idle step?
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post #2 of 8 (permalink) Old Oct 18th, 09, 03:32 PM
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Re: 69 327 rochester 2GV carb non electric choke adjustment

Steve, first an original 327 2bbl carb did not have an electric choke. there was a bi-metal spring on the manifold with a rod. The rod actuated a cam which the fast idle screw rides on. screw head should face the front of engine.

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post #3 of 8 (permalink) Old Oct 18th, 09, 06:32 PM Thread Starter
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Re: 69 327 rochester 2GV carb non electric choke adjustment

Bi-metal is the name, thats why I called it non electric. How do I know if its working correctly?
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post #4 of 8 (permalink) Old Oct 18th, 09, 07:18 PM
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Re: 69 327 rochester 2GV carb non electric choke adjustment

sorry, Steve, did not read the "not" The bi metal spring has a range (hot/cold), you need a cover!. the rod and cam also have a range (choke closed/open). the length of the rod is used to match these ranges, so when the spring is cold and you hit the gas, it closes the choke. If it does not, you bend the rod until the choke closes when the engine is cold and you hit the gas pedal. Then you need to adjust the fast idle screw when the choke is closed. there is also some adjustment with the vac unloader. This info should be in the tune-up specs section of a chiltons, motors, etc.

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post #5 of 8 (permalink) Old Oct 19th, 09, 04:10 AM
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Re: 69 327 rochester 2GV carb non electric choke adjustment

Along with Kevin's suggestions, the heat riser needs to work correctly and the manifold crossover should be open and clean of carbon.

The heat riser is closed when cold diverting the pass exhaust through the intake to drvr side to heat up the carb and choke spring. as heat is generated, both, the heat riser and choke, open up.

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post #6 of 8 (permalink) Old Oct 19th, 09, 02:25 PM Thread Starter
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Re: 69 327 rochester 2GV carb non electric choke adjustment

When I open the throttle the choke does close and when car is started the choke pull off does open it up some. I have ordered a set of carb gauges that should be in soon.
A friend at work welded the heat riser open years ago, not sure if that was a good idea?
Where is the manifold cross over located, is that the hole in the front of the carburetor and manifold front base.
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post #7 of 8 (permalink) Old Oct 19th, 09, 02:40 PM
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Re: 69 327 rochester 2GV carb non electric choke adjustment

The manifold x-over is another opening between the exhausts that go under the manifold. When the heat riser is closed, it forces the exhaust to the drivers side, heating up the manifold and bi-metal spring. It can work without it, just takes a little longer to heat up.

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post #8 of 8 (permalink) Old Oct 20th, 09, 07:12 PM Thread Starter
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Re: 69 327 rochester 2GV carb non electric choke adjustment

The carb gauges came in today so i will be bable to see if the adjustments are correct.
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