Cometic Chevy BB Gen IV 396/402/427/454 H/G 4.320 inch Bore .030 inch MLS Head Gasket

Cometic Chevy BB Gen IV 396/402/427/454 H/G 4.320 inch Bore .030 inch MLS Head Gasket

Marsoni

M251S

$153.00

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

Cometic Chevy BB Gen IV 396/402/427/454 H/G 4.320 inch Bore .030 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. 030". 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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A solidly constructed jig used for easily creating either a 5mm or 1/4" shelf pin holes. Mark your control line and place the jig on it while using two thumb screws that act as both a clamp and edge guide for perfectly aligned holes. Various thumb screw holes allows for holes that are closer to the edge of your work or for holes further in from the edge.

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Reviewed in the United States on February 18, 2026

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Juicer

Carnegie, US

★★★★★ 5

Good product

Size: 11 Holes

Works well for the must part. I ended up buying a different style bit collar stop because the one provided wasn't solid enough for me. Might be a personal preference

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Reviewed in the United States on January 7, 2026

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whodg

Phoenix, US

★★★★★ 5

Awesome tool

Very easy to use, only issue I had was the location pin was a bit tight. Chucked it in the drill and polished it up with a scotch-brite and it worked perfectly. The end to end symmetry made it easy to move from one side to the other. Good price as well!

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Reviewed in the United States on September 24, 2024

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Road Warrior Ray

Lowell, US

★★★★★ 4

Excellent 11 hole jig

Size: 11 Holes

This jig worked excellently. It doesn't have any instructions, so I watched the video of it. I set it up the way the video showed, and I got decent results. Deducted a star since no instructions.

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Reviewed in the United States on April 18, 2026

Verified Purchase

Janis E White

Waukegan, US

★★★★★ 5

Perfect hole placement

Size: 11 Holes

Worked exactly as described.

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Reviewed in the United States on September 24, 2025