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 Mystery 4G(C?) 
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Joined: Mon Dec 29, 2014 1:26 am
Posts: 433
I found this thing in a trash pile after someone attempted and failed a rebuild. No tag, no number stamped on the lid. I've checked the available parts diagrams to match up the gasket, looks to match the 65-67 327 truck parts, but when I look up rebuild kits for those carb numbers (7025125, 7036125, 7027125, 7037125) the gaskets shown are different than the old Rochester docs. Anybody recognize it?

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Here's the 'problem' that was so unfixable as to cause it to be dropped in the trash... I guess back then a new carb only cost $15.99? :w00t:

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Thu Mar 12, 2015 7:52 am
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Joined: Fri Feb 08, 2013 2:37 pm
Posts: 1695
Post a shot of the base from the side. The linkage looks like Olds or Cadillac, maybe Buick or Olds ?? 4GC was used on Packard too. Big secondary like that reminds me of 394 Olds or 390 Cadillac. It's been a while.


Fri Mar 13, 2015 2:00 am
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Joined: Mon Dec 29, 2014 1:26 am
Posts: 433
Image

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I think it needs a few more vent tubes, just in case. ;)

Has hot air choke, A.I.R. valve, and the exhaust heat crossover trough-thing is in the bottom surface of the throttle body. I think I was able to find all the hard parts except for the pump linkage & fast idle rod (the one in pics I think is one I made).

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Fri Mar 13, 2015 4:13 am
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Joined: Fri Feb 08, 2013 2:37 pm
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Did you figure out what this carb is for? Look in the Old Car Manual Project and dig through the Rochester carb manuals.


Tue Mar 17, 2015 11:23 pm
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Joined: Mon Dec 29, 2014 1:26 am
Posts: 433
I studied the old exploded view parts lists and just got more confused. The pictures seem to sometimes be generic stand-ins, like this example for the '65 Olds 4GC...

Image

Those two parts clearly don't go together, do they?

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Wed Mar 18, 2015 12:13 am
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Joined: Fri Feb 08, 2013 2:37 pm
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Some Rochester 2G and 4G used slots in the base gasket to the outside for vapor vents, like the hole drilled in the throttle bore of old Holleys above the throttle shaft.


Wed Mar 18, 2015 12:51 am
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