Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks


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#379853 12/05/16 08:36 PM
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When re-installing the carburetor on a 1950 216, should anything be applied to the manifold, base gasket of the carb itself to make a better seal?

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Sealer is not used on any carburetor gaskets. A good snug fit is all that is necessary. I assume around 10 to 15 pounds of torque.

Good luck, Mike

Last edited by Mike Buller; 12/05/16 09:15 PM.

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The factory did not use a gasket under the carburetor. The thick insulator block goes first directly on the manifold (with notches up). The Carb. sits directly on the insulator block. They are all perfectly flat machiened surfaces so there will be no vacuum leak as long as they are clean.


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You need the insulater block for sure! If you dont have one let me know. I think I have extra.

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They are available from the Filling Station, etc new..The old orginals tend to crack after they get 50 years old.


Gene Schneider
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No sealer x3 but adding internal star washers won't hurt. Recheck the nuts after the test run and once more "later on".

I remember reading "somewhere" 1950 was a transitional year with some Rochester carbs using the smaller W-1 bore and spread. If that was true and you have one, order 1941-1948 parts.

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The 216 carburetor has an 1 1/2" bore and the 235 1 9/16" plus the studs are farther apart on a 235.


Gene Schneider
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The FS got it right, so there's no problem ordering from there. Does anyone repro the extension pipe that goes inside the insulator? Couldn't find one on any diagram, eBay sale or in any discussion either. Maybe the one in our 48 is an anomaly but sure looks and fits like factory.

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The insulator block with the metal sleve was used on 1949 and prior engines that came with a Carter carburetor. It was discontinued in the early '50's and replaced by the later solid single piece insulator like Chevrolet used with the Rochester Carb. from 1950 and up.
If a Rochester was used to replace a Carter a thick spacer gasket was used with the old style insulator to give vacuum access to the ports on the botom of a Rochester. The vacuum port notches are built into the later insulator so gasket spacers are not necessary if a Rochester is installed and the later insulator works fine with a Carter also.


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Oh, cool. So that change would give the vacuum advance access to manifold vacuum at idle and port vacuum for light throttle high speed cruising?

The thicker add-on gasket I think maybe the same stock gasket for our 1965 194. It has four notches so it's impossible to install incorrectly.

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The vacumm ports are not for the vacuum advance but for the power piston in the carb. When the vacuum drops under engine load the power pistons makes the mixure more rich, at high vacumm less gas.


Gene Schneider
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Seems they missed an opportunity to do both. Lean mixtures take longer to burn, so a little more advance at idle is a good thing.

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The vacuum port just above the throttle plate in the carb. gets vacuum to the vacuum advance just as soon as the throttle plate is open past idle speed. This is a seperate device.


Gene Schneider
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Hmmmm, well unless something internal substantially changed, 15 years later, our BV must have an issue. Even at 100-150 rpm below idle the advance is getting a signal. With the 48's W-1 at idle there's no signal at all.


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