Cometic GM LS1 SB 4.000 inch Bore .040 inch MLS Head Gasket

Cometic GM LS1 SB 4.000 inch Bore .040 inch MLS Head Gasket

Marsoni

M251S

$97.60

Get it in 3 business days with 1 day shipping. Friday, May 29

Cometic GM LS1 SB 4.000 inch Bore .040 inch MLS Head GasketComprised of multiple embossed layers of stainless steel with the outer layers utilizing a Viton rubber coating. Compressed operating thickness is 0. 040". Cometic MLS (Multi Layer Steel) Head Gaskets provide maximum sealing performance for todays high output engines and require no sealants. MLS gaskets are ideal for both aluminum heads to aluminum blocks and aluminum heads to cast iron blocks. They can withstand the shearing force created by the two

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I just received these for my son. They are very nice and look sturdy, but he hasn't worn them yet, so I cannot speak to how well they hold up in the wash or when worn. They appear to be the right size and look stretchy, but not the kind of stretchy that feels super tight on the foot (which I don't like). If they wear unusually well or poorly, I will come back and edit this.

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Reviewed in the United States on December 26, 2025