Header Gaskets

Header Gaskets: the seal that keeps your header working

A header gasket sits between the cylinder head exhaust ports and the header flange, sealing hot combustion gases so they leave through the primaries instead of blowing out at the joint. When you bolt on a set of headers, the old factory gasket rarely matches the new flange, and a re-used gasket tends to leak once the bolts are torqued and heat-cycled. Fresh header gaskets give you a clean crush, even clamping, and no tick from a leaking port. If you're pulling a header off for any reason, plan on new gaskets going back on.

What ThreePiece stocks

We currently show 6 header gasket sets from 2 brands: BBK and JBA. Prices run from $61 to $69, which is the current range for what's in stock rather than a fixed promise. BBK makes up most of the selection, with JBA covering Gen III Hemi applications.

Product names in this category reference Dodge, Ford, Ram and Chrysler applications. Detailed fitment data is listed for one product covering the Ford Mustang, 2011 to 2020, so check each listing for the engine and port shape it's cut for.

How to choose

The main decision here is matching the gasket to your header's port shape and your engine. A D-port Gen III Hemi gasket like the JBA set won't seat right against a differently ported flange, so start from the exact engine and header you're running. Beyond that, buying the gasket from the same brand as your header is the safest route to a matched pattern. With only a few dollars separating the JBA and BBK sets, price isn't the deciding factor in this category, fit is.

What else you need

Gaskets are a piece of the exhaust job, not the whole thing. If you're upgrading beyond the headers, look at exhaust pipes, exhaust flanges to mate everything up, and a cat-back exhaust or axle-back system to finish the run. Catalytic converters and mufflers round out the section. Browse everything in the Exhaust department if you're building a full system.

Fitment help and ordering

Not sure which set matches your header and engine? Call our fitment line at 813-535-5801 before you order, or reach us through contact us. Every order ships with free shipping, and Affirm and Katapult financing is available at checkout if you're building the whole exhaust at once.

Header Gaskets: the seal that keeps your header working

A header gasket sits between the cylinder head exhaust ports and the header flange, sealing hot combustion gases so they leave through the primaries instead of blowing out at the joint. When you bolt on a set of headers, the old factory gasket rarely matches the new flange, and a re-used gasket tends to leak once the bolts are torqued and heat-cycled. Fresh header gaskets give you a clean crush, even clamping, and no tick from a leaking port. If you're pulling a header off for any reason, plan on new gaskets going back on.

What ThreePiece stocks

We currently show 6 header gasket sets from 2 brands: BBK and JBA. Prices run from $61 to $69, which is the current range for what's in stock rather than a fixed promise. BBK makes up most of the selection, with JBA covering Gen III Hemi applications.

Product names in this category reference Dodge, Ford, Ram and Chrysler applications. Detailed fitment data is listed for one product covering the Ford Mustang, 2011 to 2020, so check each listing for the engine and port shape it's cut for.

How to choose

The main decision here is matching the gasket to your header's port shape and your engine. A D-port Gen III Hemi gasket like the JBA set won't seat right against a differently ported flange, so start from the exact engine and header you're running. Beyond that, buying the gasket from the same brand as your header is the safest route to a matched pattern. With only a few dollars separating the JBA and BBK sets, price isn't the deciding factor in this category, fit is.

What else you need

Gaskets are a piece of the exhaust job, not the whole thing. If you're upgrading beyond the headers, look at exhaust pipes, exhaust flanges to mate everything up, and a cat-back exhaust or axle-back system to finish the run. Catalytic converters and mufflers round out the section. Browse everything in the Exhaust department if you're building a full system.

Fitment help and ordering

Not sure which set matches your header and engine? Call our fitment line at 813-535-5801 before you order, or reach us through contact us. Every order ships with free shipping, and Affirm and Katapult financing is available at checkout if you're building the whole exhaust at once.