Carburetor Gaskets

While it may look relatively simple, a carburetor base plate gasket does a few very important jobs. For starters, a good carb mounting gasket will ensure an airtight...

While it may look relatively simple, a carburetor base plate gasket does a few very important jobs. For starters, a good carb mounting gasket will ensure an airtight seal between the carburetor body and the intake manifold. A proper seal is very important here, because even a small leak can greatly affect the way your carbureted engine performs. A leaky carb seal also makes it really difficult to properly tune your carburetor and can contribute to a ton of other engine issues, including things like a poor idle, hesitation upon acceleration, and a loss of top-end power.

A carb mounting gasket can also act as a thermal barrier...

A carb mounting gasket can also act as a thermal barrier between a baking-hot intake manifold and the carburetor flange. By creating more isolation between those two mating surfaces, a good carb base plate gasket can mitigate a lot of heat soak coming from the engine—which can go a long way to prevent nagging fuel delivery problems like vapor lock.

And while carb mounting gasket thickness is often associated with its ability to block heat, there are a few other factors that need to be considered when selecting the thickness of your carburetor gasket. For instance, you may need to raise your carburetor body up a bit to provide room for vacuum ports or, conversely, opt for a thinner gasket to ensure proper hood clearance.

There are plenty of carburetor base plate gasket options available. To determine which one is right for your engine and carburetor, first determine the type of carburetor flange you’ve got. Common flange designs include square bore and spread bore, but there are several other flange layouts depending on the carburetor model you’re running.

Once you’ve determined the type of carburetor flange you’ve got (spread bore, square bore, etc.), then you can choose the overall carburetor base gasket thickness you need, followed by the type of material you want your carburetor gasket made from. Carb mounting gaskets are commonly made from paper, yet several nitrile rubber and other composite materials are popular as well. Each material has its pros and cons, so you may want to do a quick bit of research before selecting the best carburetor gasket material for your engine.

Spread bore or square bore, two barrel or four, when you’re ready to start shopping for carburetor base plate gaskets, use the intuitive filters on SummitRacing.com to pinpoint the precise one you need.

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Holley Carburetor Insulator Gaskets 108-37

Carburetor Gaskets, Insulator Gasket, 4-Barrel, Spread Bore, 0.625 in. Thick, Phenolic, Models 4165, 4175, Quadra-Jet, Each

Part Number: HLY-108-37

4.57 out of 5 stars ( 7 )

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Mr. Gasket Carburetor Base Gaskets 56A

Carburetor Mounting Gasket, Cellulose/Nitrile Composite, 4-Barrel, Quadrajet, Open Center, .063 in. Thick, Each

Part Number: MRG-56A

4.58 out of 5 stars ( 12 )

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SCE Carburetor Base Gaskets 357

SCE Carburetor Base Gaskets 357

Carburetor Mounting Gaskets, Insulator Gasket, Composite, 4-Barrel, Quadrajet Spread Bore, Open Center, Each

Part Number: SCE-357

5.0 out of 5 stars ( 1 )

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Mr. Gasket Carburetor Base Gaskets 56

Carburetor Mounting Gasket, Cellulose/Nitrile Composite, 4-Barrel, Quadrajet, 4-Hole, .063 in. Thick, Each

Part Number: MRG-56

4.83 out of 5 stars ( 6 )

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SCE Carburetor Base Gaskets 356

Carburetor Mounting Gaskets, Composite, 4-Barrel, Quadrajet Spread Bore, 4-Hole Center, Set of 10

Part Number: SCE-356

5.0 out of 5 stars ( 1 )

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Flatout Gaskets Carburetor Mounting Gaskets 1044

Carburetor Mounting Gasket, Paper with Silicone Coating, 4-Barrel, Quadrajet, Open Center, .030 in. Thick, Each

Part Number: FOG-1044

Not Yet Reviewed

Estimated Ship Date: Oct 20, 2025 if ordered today

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Estimated Ship Date: Oct 20, 2025 if ordered today

Mr. Gasket Carburetor Base Gaskets 56C

Carburetor Mounting Gasket, Cellulose/Nitrile Composite, 4-Barrel, Quadrajet, 4-Hole, .063 in. Thick, Each

Part Number: MRG-56C

5.0 out of 5 stars ( 9 )

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Moroso Carburetor Base Gaskets 93312

Carburetor Base Gasket, Quadrajet, Open Center

Part Number: MOR-93312

Not Yet Reviewed

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Offenhauser Carburetor Base Gaskets 5495

Carburetor Mounting Gasket, Paper, 4-Barrel, Quadrajet, 4-Hole, Each

Part Number: OFY-5495

4.4 out of 5 stars ( 5 )

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Trans-Dapt Performance Carburetor Gaskets 2070

Carburetor Mounting Gasket, Nitrile Rubber Composite, 4-Barrel, Quadrajet, 4-Hole, .032 in. Thick, Each

Part Number: TRD-2070

4.88 out of 5 stars ( 8 )

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Remflex Inc. Carburetor Base Plate Gaskets 56RX

56RX - EDELBROCK, ROCHESTER "QUADRAJET" Carb Gasket - 4 BARREL - 4 HOLE - 1/16" Thk Paper- 20 Piece Minimum Bulk Pack - Price per Pack

Part Number: RFL-56RX

Not Yet Reviewed

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Fel-Pro Marine Carburetor Mounting Gaskets 17844

Gasket, Marine Carburetor Mounting Type, 4 Barrels, Spread Bore, 4-Hole, 0.063 in., Composite, Fel-Pro, Each

Part Number: FEL-17844

Not Yet Reviewed

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Fel-Pro Marine Carburetor Mounting Gaskets 17843

Gasket, Marine Carburetor Mounting Type, Spread Bore, 4-Barrel, Open Center, 0.250 in. Thick, Paper, Each

Part Number: FEL-17843

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Fel-Pro Marine Carburetor Mounting Gaskets 17845

Gasket, Marine Carburetor Mounting Type, Spread Bore, 4-Barrel, 4-hole, 0.250 in. Thick, Paper, Each

Part Number: FEL-17845

5.0 out of 5 stars ( 2 )

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