Siruda

• Metal head gaskets: stopper and grommet multi-layer steel gaskets, each listing offering the bore and thickness options Siruda makes for that engine
• Hot side gaskets: exhaust manifold, turbo and turbo pipe gaskets
• Intake gaskets: intake manifold and throttle body gaskets
• Engine gasket sets: full and middle sets for an engine rebuild (head gasket not included)

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Siruda gaskets are engine-specific. Check your engine code first, then pick the bore and thickness:

• Bore: match your cylinder bore, including any oversize from a rebuild
• Thickness: a thicker gasket lowers compression and adds piston-to-head clearance
• Type: stopper gaskets keep a stable seal under vibration; grommet gaskets suit high cylinder pressure

Siruda quotes two thickness figures: the thickness at the combustion seal and the body thickness. Each listing shows both in its specifications. If you're unsure, contact our team before ordering.

Installation by a professional is recommended. Head gaskets must be fitted to clean, flat deck faces by a qualified engine builder, with the head bolts or studs tightened in sequence to the correct torque. Flat-four and V engines need one head gasket per bank.

Which Siruda head gasket thickness do I need?
Measure piston deck height and work out the compression ratio you want with your engine builder. A thicker gasket lowers compression and adds piston-to-head clearance.

What is the difference between Siruda stopper and grommet head gaskets?
A stopper gasket adds a stopper layer between the steel layers around each bore for a stable seal under vibration. A grommet gasket puts a coated metal grommet around each bore to hold back combustion gas under high cylinder pressure.

Do Siruda full gasket sets include a head gasket?
No. The sets leave out the head gasket so you can choose the type and thickness to suit your build.

How many head gaskets does a Subaru EJ engine need?
Two, one for each cylinder head. Siruda head gaskets are sold individually.