Cometic 4.100 MLS Head Gasket .040 - SB Chevy LT1 SR91152PUO-6 Z-Optics Tear Offs do not

Z-Optics Tear Offs do not block UV light

Valve seats and phosphorous bronze guides are installed

Properly reinforced in all critical areas

23 and numerically higher ratio gear sets with standard thickness ring gears into 3

Cometic 4.100 MLS Head Gasket .040 - SB Chevy LT1 SR91152PUO-6 Z-Optics Tear Offs do notComprised 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