Cometic Gasket

• Subaru EJ20 turbo (93mm and 93.5mm bore): MLS gasket for EJ205/EJ20G and MLX gasket for EJ205. More for the Impreza WRX (GD) and Impreza WRX (GC).
• Subaru EJ25 (to 2006): MLS gasket, 100mm bore and MLX gasket, 101mm bore.
• Subaru EJ255/EJ257 (2007 to 2018, 101mm bore): MLS gasket and MLX gasket. More for the WRX STI (GD), WRX STI (GR), WRX STI (GV) and WRX STI (VA).
• Honda K20C1: MLX gasket for the Civic Type R. More for the Civic Type R (FK8) and Civic Type R (FL5).
• Ford Focus RS (LZ), 89mm bore: MLX gasket. More for the Focus RS (LZ).
• Audi 2.5 TFSI DAZA/DNWA, 83.5mm bore: MLX gasket .055". More for the RS3 (8V Facelift), RS3 (8Y) and TT RS (8S).

Browse other performance brands on our brands page.

Cometic MLS gaskets have multiple layers of stainless steel. The outer layers are embossed and coated with Viton rubber. This design lets the gasket act like a spring, so it keeps a consistent seal as the cylinder head and block expand and contract at different rates.

To choose the right gasket, match these details to your engine:

• Engine code: for example EJ205, EJ255/EJ257, K20C1 or DAZA/DNWA.
• Chassis code: for example FK8 or FL5 for the Honda Civic Type R.
• Bore size: for example 93mm or 93.5mm (Subaru EJ205), 101mm (Subaru EJ255/EJ257), 89mm (Focus RS) or 83.5mm (Audi 2.5 TFSI).
• Thickness: for example 1.0mm or .055". Engine builders use gasket thickness to correct deck height or fine-tune compression ratio after machining.

Cometic MLS gaskets are installed dry. Do not add copper spray or other sealants. The cylinder head and block surfaces must be clean, flat and finished to 50 RA (Roughness Average) or finer.

Note: Installation by a professional is recommended.

Where can I buy Cometic head gaskets in Australia?
Chicane Australia sells Cometic MLS and MLX head gaskets and ships Australia-wide from the NSW Central Coast. Match the engine code, bore and thickness in the product title, search by Cometic part number, or contact our team before you order.

What surface finish is required for a Cometic MLS gasket?
Cometic recommends a surface finish of 50 RA (Roughness Average) or finer on clean, flat head and block surfaces. If the surface is too rough, the Viton coating may not fill the surface peaks and valleys, which can lead to leaks.

Do Cometic MLS gaskets require copper spray?
No. Cometic MLS gaskets are installed dry. Their Viton coating is designed to bond to the mating surfaces during the heat cycle, and copper spray or other sealants can interfere with that coating.

Why does gasket thickness matter?
Gasket thickness affects deck height and compression ratio. Engine builders choose a thickness to suit their machining and build goals.

Are the Subaru Cometic gaskets sold in pairs?
No. Each Subaru listing is a single gasket for one cylinder head, so a flat-four EJ engine needs two. Match the engine code, bore and thickness in the title before you order.