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Part number: C5691-040
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Product Details
Cometic C5691-040 in our Head Gaskets Deptartment
Products specifications
Bore 3.860in
Bore (in) 3.860 in.
Bore (mm) 98.044mm
Calculator Compression Calculator
Compressed Thickness (in) 0.040 in.
Compressed Volume (cc) 7.670cc
Gasket Material Multi-layer steel
Lock Wire No
Material MLS
Notes Buick Stage I and II
Quantity Sold individually.
Thickness .040in
Bore Diameter 3.860"
Engine Buick 192, 231, 252ci V6
Cylinder Head Type Stock and Stage I-II Heads
Head Gasket

Cometic Head Gaskets are developed with the performance enthusiast in mind. With so many individual requirements for each motor Cometic offers a number of options to suit your specific motor and needs.

MLS
The Cometic MLS gasket is comprised of three layers of Stainless Steel. Cometic uses Stainless steel for increased strength, its ability to rebound and corrosion resistance. The outer layers of the gasket are embossed and coated on both sides with a flouroelastomer rubber based material (Viton) designed to meet the demands of a variety of harsh sealing environments, load conditions and surface finishes. The Viton coating is heat resistant to 2500C or 4820F.

The center or shim layer of the gasket is comprised of an uncoated Stainless Steel layer, which can be varied to accommodate multiple thickness requirements. The MLS gasket is ideal for both aluminum heads to cast iron blocks and aluminum heads to aluminum blocks.

The composition of MLS will also withstand the shearing forces created by aluminum heads on cast iron blocks. No re-torque is necessary. By design the MLS gasket promotes an even torque load across the sealing surface allowing for measurable reduced bore distortion.

CFM-20
A perforated steel core with an elastomer surface is ideal for head gaskets allowing heat to be drawn evenly across the gasket surface while providing maximum sealing characteristics when exposed to coolants and oils.

COPPER

Reviews
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L
Lowest price I could find in the net. It was easy to order. Delivered on time. I'll buy again.
Q
Great pricing, fast shipping, A+++
T
Extremely fast shipping - shipped the next business day and I was notified via email about everything.  Also, VERY good pricing on the products AND shipping.  Thanks!
J
Better product description and more accurate pictures would be nice
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Fitment
Buick Century
1987 Buick Century Custom / Estate Wagon / Limited
1986 Buick Century Custom / Estate Wagon / Limited / T-Type
1985 Buick Century Custom / Estate Wagon / Limited / T-Type
1984 Buick Century Custom / Estate / Limited / Olympia Limited / T-Type
1983 Buick Century Custom / Estate / Limited
1982 Buick Century Custom / Estate / Limited
1981 Buick Century Base / Custom / Estate / Limited / Sport
1980 Buick Century Base / Custom / Estate / Limited / Sport
1979 Buick Century Base / Custom / Limited / Special / Sport
1978 Buick Century Base / Custom / Limited / Special / Sport
1977 Buick Century Base / Custom / Special
1976 Buick Century Base / Custom / Special
1975 Buick Century Base / Custom / Special
Buick Electra
1987 Buick Electra Limited / Park Avenue / T-Type
1986 Buick Electra Limited / Park Avenue / T-Type
1985 Buick Electra Limited / Park Avenue / T-Type
1984 Buick Electra Limited / Park Avenue
1983 Buick Electra Limited / Park Avenue
1982 Buick Electra Limited / Park Avenue
1981 Buick Electra Limited / Park Avenue
1980 Buick Electra Limited / Park Avenue
Buick LeSabre
1987 Buick LeSabre Base / Custom / Limited / T-Type
1986 Buick LeSabre Base / Custom / Limited
1985 Buick LeSabre Base / Collector's Edition / Custom / Limited
1984 Buick LeSabre Base / Custom / Limited
1983 Buick LeSabre Base / Custom / Limited
1982 Buick LeSabre Base / Custom / Limited / Limited Edition F/E
1981 Buick LeSabre Base / Custom / Limited / Sport
1980 Buick LeSabre Base / Custom / Limited / Sport
1979 Buick LeSabre Base / Custom / Limited / Sport
1978 Buick LeSabre Base / Custom / Sport
1977 Buick LeSabre Base / Custom
1976 Buick LeSabre Base
Buick Regal
1987 Buick Regal Base / GNX / Grand National / Limited
1986 Buick Regal Base / Grand National / Limited / T-Type
1985 Buick Regal Base / Grand National / Limited / T-Type
1984 Buick Regal Base / Grand National / Limited / T-Type
1983 Buick Regal Base / Estate Wagon / Limited / T-Type
1982 Buick Regal Base / Estate Wagon / Limited / Limited Turbo / Sport
1981 Buick Regal Base / Limited / Sport
1980 Buick Regal Base / Limited / Sport
1979 Buick Regal Base / Limited / Sport
1978 Buick Regal Base / Limited / Sport
1977 Buick Regal Base / SR
1976 Buick Regal Base / SR
1975 Buick Regal Base
Buick Riviera
1987 Buick Riviera Luxury / T-Type
1986 Buick Riviera Luxury / T-Type
1985 Buick Riviera Base / Luxury / T-Type
1984 Buick Riviera Base / Luxury / T-Type
1983 Buick Riviera Base / Luxury / T-Type / XX Anniversary Edition
1982 Buick Riviera Base / Limited Edition / T-Type
1981 Buick Riviera Base / T-Type
1980 Buick Riviera Base / S
1979 Buick Riviera S
Buick Skyhawk
1980 Buick Skyhawk Base / Designers' Accent Edition / Road Hawk / S
1979 Buick Skyhawk Base / Road Hawk / S
1978 Buick Skyhawk Base / S
1977 Buick Skyhawk Base / S
1976 Buick Skyhawk Base / S
1975 Buick Skyhawk Base / S
Buick Skylark
1979 Buick Skylark Base / Custom / S
1978 Buick Skylark Base / Custom / S / Sport
1977 Buick Skylark Base / S / SR
1976 Buick Skylark Base / S / SR
1975 Buick Skylark Base / SR
Show All Vehicle Fitments
Return Policy
Returns are easy at THMotorsports
Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy