Head Gaskets

Head Gaskets: the seal that keeps combustion, coolant and oil apart

The head gasket sits between the cylinder head and the block, sealing each combustion chamber while keeping coolant and oil passages separate. When it fails you get the classic symptoms: coolant loss, white smoke, oil and water mixing, or loss of compression between cylinders. You fit a fresh head gasket any time you pull the head - for a rebuild, a valve job, or a repair - and builders running higher boost often step up to a thicker or reinforced gasket to hold cylinder pressure that a stock unit was never designed for. Getting the surfaces clean, flat and torqued to spec is the whole job; the gasket does the rest.

What ThreePiece stocks

This category carries 435 head gaskets and head sets across 10 brands, with current in-stock prices running from $43 to $1,146. That price is the live range for what's on the shelf now, not a fixed quote. The bulk of the range is Cometic Gasket (392 listings), backed by HKS, Supertech, Skunk2 Racing, Victor Reinz, S&S Cycle, BLOX Racing, Fleece Performance, TwinPower and Mahle OE. Of these, 184 listings carry specific fitment data covering makes including Honda, Nissan, Toyota, BMW, Subaru, Mazda, Ford, Dodge, Mitsubishi and Chevrolet - popular platforms like the Honda Civic, Mazda Miata, Subaru WRX, Nissan 240SX, Toyota Supra and BMW M3 all show up.

How to choose

The split here is between OE-style replacement sets and performance gaskets built for boost. If you're repairing a stock engine, a complete head set like the MAHLE Original Toyota 4Runner head set or the Mahle OE Dodge Cummins 6.4L head gasket set gets you the gasket plus the surrounding seals in one box - fewer part numbers to chase. Note that some sets, like the MAHLE Original GM 6.6L Duramax head set, are sold without the head gasket itself, so read the listing.

If you're building for pressure, the thicker performance options are the reason those higher prices exist. The HKS 2.0mm stopper head gasket for the 93-98 Supra Turbo, its MK3 counterpart, and the Supertech BMW S50/S52 copper-ring gasket are aimed at high-boost setups. A thicker gasket changes compression and deck clearance, so match it to your build rather than defaulting to the strongest part.

What else you need with it

A head gasket rarely goes back on alone. Check Gasket Kits for the remaining engine seals, and if you're deep into a rebuild look at Pistons and Bearings. Since head jobs often start with a cooling failure, it's worth inspecting Radiators and Oil Filters before you button things up. Browse the full Engine Components section for the rest.

Fitment and ordering

All orders ship free, and Affirm and Katapult financing is available on bigger builds. If you're unsure which gasket matches your exact engine and year, call fitment help at 813-535-5801 or reach us through contact us before ordering.

Head Gaskets: the seal that keeps combustion, coolant and oil apart

The head gasket sits between the cylinder head and the block, sealing each combustion chamber while keeping coolant and oil passages separate. When it fails you get the classic symptoms: coolant loss, white smoke, oil and water mixing, or loss of compression between cylinders. You fit a fresh head gasket any time you pull the head - for a rebuild, a valve job, or a repair - and builders running higher boost often step up to a thicker or reinforced gasket to hold cylinder pressure that a stock unit was never designed for. Getting the surfaces clean, flat and torqued to spec is the whole job; the gasket does the rest.

What ThreePiece stocks

This category carries 435 head gaskets and head sets across 10 brands, with current in-stock prices running from $43 to $1,146. That price is the live range for what's on the shelf now, not a fixed quote. The bulk of the range is Cometic Gasket (392 listings), backed by HKS, Supertech, Skunk2 Racing, Victor Reinz, S&S Cycle, BLOX Racing, Fleece Performance, TwinPower and Mahle OE. Of these, 184 listings carry specific fitment data covering makes including Honda, Nissan, Toyota, BMW, Subaru, Mazda, Ford, Dodge, Mitsubishi and Chevrolet - popular platforms like the Honda Civic, Mazda Miata, Subaru WRX, Nissan 240SX, Toyota Supra and BMW M3 all show up.

How to choose

The split here is between OE-style replacement sets and performance gaskets built for boost. If you're repairing a stock engine, a complete head set like the MAHLE Original Toyota 4Runner head set or the Mahle OE Dodge Cummins 6.4L head gasket set gets you the gasket plus the surrounding seals in one box - fewer part numbers to chase. Note that some sets, like the MAHLE Original GM 6.6L Duramax head set, are sold without the head gasket itself, so read the listing.

If you're building for pressure, the thicker performance options are the reason those higher prices exist. The HKS 2.0mm stopper head gasket for the 93-98 Supra Turbo, its MK3 counterpart, and the Supertech BMW S50/S52 copper-ring gasket are aimed at high-boost setups. A thicker gasket changes compression and deck clearance, so match it to your build rather than defaulting to the strongest part.

What else you need with it

A head gasket rarely goes back on alone. Check Gasket Kits for the remaining engine seals, and if you're deep into a rebuild look at Pistons and Bearings. Since head jobs often start with a cooling failure, it's worth inspecting Radiators and Oil Filters before you button things up. Browse the full Engine Components section for the rest.

Fitment and ordering

All orders ship free, and Affirm and Katapult financing is available on bigger builds. If you're unsure which gasket matches your exact engine and year, call fitment help at 813-535-5801 or reach us through contact us before ordering.