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Old 05-02-2020, 06:29 PM
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Default 62 GP 389 AFB gaskets and PVC question

Pulled of the factory AFB off my GP today. Can anyone tell me why there are 3 gaskets under it? There’s a normal gasket , a steel spacer like gasket and then a foil gasket. All that came with my rebuild kit is a normal carb base gasket. I also noticed slots and holes in the factory gaskets. I’m not sure what’s going on. Also does my 62 ha e a PVC valve? There’s a F connector in front of the Carl that runs to the valley pan. Should there be a PVC valve on that? Thanks

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Old 05-02-2020, 08:13 PM
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On my intake there was a carb gasket, then a metal space, then a foil baffle like gasket. Do I need to reinstall these 3 gaskets?

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Old 05-02-2020, 08:49 PM
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64-3Deuces 64-3Deuces is offline
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The Pontiac parts book only calls for one carb to intake gasket. It sounds like the PO was trying to solve some type of heat soak problem with the multi gasket set up.

My 62 Cat had a draft tube-no PCV, however the catalog does show a valve package CV-679C for 57-62. Maybe that was on California cars. The "F" connector is also shown and would appear to indicate the use of a PCV valve. Follow the hose from the connector to the valley pan and see what it is connected to. It sounds like it should be a PCV valve. The valve sits kind of below the intake runners so it may hard to see. Just pull up on that end of the hose and the valve will pop out of the valley pan grommet.

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Old 05-02-2020, 08:56 PM
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'62 Pontiacs delivered in California had PCV and the remaining states had down draft tubes (there may have been other states that required pcv in '62? that I am not aware of?). The "F" connector indicates that your car was probably a Califirnia car. Is there an "S" in your vin # ie "362sxxxx"?

You can mount your carb using only the base gasket that came in your rebuild kit but the metal spacer and foil baffle can also be reinstalled if they allow a complete seal between the carb and manifold. The metal spacer and baffle were there to allow the carburetor to operate at a slightly lower temperature and to avoid erosion of the aluminum body.

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Old 05-02-2020, 09:42 PM
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Great info fellows. I’ll look at it more tomorrow. Thanks!

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Old 05-03-2020, 05:37 PM
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Ok. The foil top gasket is toast. The bottom gasket and the thick still spacer are still ok. I think I’ll just clean those two and make a sandwich with my new gasket with the steel in the middle. My car definitely has a pcv in the rear of the valley pan. Pretty sure it’s factory. Car made in April 1962 and shipped to Taber Pontiac in Atlanta per PHS I’ll post pics of a conservation I had with phs

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Old 05-03-2020, 05:40 PM
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PHS
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Old 05-03-2020, 05:43 PM
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PHS2
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Old 05-03-2020, 05:46 PM
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No "S" in Vin, just a "D"

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Old 05-04-2020, 10:58 AM
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A "D" is Doraville (ie Atlanta per your PHS)

PCV was easy to add in states which may not have required it in 1962. May have been an order sheet option. 2bbl and 4bbl manifolds were drilled for the nipples to the "F" fitting and plugged with pipe plugs. Just pull off the draft tube and pipe plugs and add the tubing, fittings and PCV valve. 3x2 manifolds were not drilled until maybe 63 or 64. To add PCV there was a spacer under the center carb with a pipe out to the rubber tubing for the PCV. As the small air cleaners were not factory until 64 a spacer of the same thickness was required under the end carbs so the big one piece air cleaner would still fit. The big air cleaner was only offered on B body until 64 and the GTO came along.

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Old 05-04-2020, 12:15 PM
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Great info. I also read that in 62 “Crankcase Vent” was an option. I think that option was chosen and that’s why my Doraville car has it instead of a draft tube.

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Old 05-04-2020, 04:06 PM
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I suppose it could have been added at some point by a previous owner as well, a lot can happen to a car in 58 years.

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Old 05-04-2020, 06:42 PM
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So true!

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