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1957 Coupe de Ville Intake Manifold Gasket

Started by cappy102, November 30, 2017, 04:32:27 PM

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At some point in the near future, I will probably have to pull the intake manifold, and, in my parts quest, I ran across this offering:

There is plenty of information out there on the manifold's drawbacks, and this gasket (with the center ports blocked) might be a solution.

What I would like to know is if anyone out there has actually tried this setup. Are there downsides that I should know about?

Thanks for any info!
1957 Cadillac Coupe De Ville
1981 Moto Guzzi V50 Monza

John Washburn CLC 1067 Sadly deceased.

These are not bad but I like the ones made by Best Gaskets which are fiber (and are thicker) not metal and block off the cross over. Olson's gaskets also sells these.

the Johnny
John Washburn
CLC #1067
1937 LaSalle Coupe
1938 6519F Series Imperial Sedan
1949 62 Series 4 Door
1949 60 Special Fleetwood
1953 Coupe DeVille
1956 Coupe DeVille
1992 Eldorado Touring Coupe America Cup Series


1957 Cadillac Coupe De Ville
1981 Moto Guzzi V50 Monza


After playing many games with search criteria, I finally found this thread:

After several dead-end search attempts I finally just typed in "365 intake manifold", and it came right up.

Also discovered that when a redundant item is posted, nobody will respond.
1957 Cadillac Coupe De Ville
1981 Moto Guzzi V50 Monza


I have had good luck just welding up the crossover in the manifold instead of trying to block the ports.

The factory spacer for the carb keeps the gas from boiling over in my car and I get the crummy ETOH stuff in California.