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.018" reinforced fiber. For S&S base pattern.
S&S

S&S, cylinder base gaskets. 4-3/8" bore

#977954

Stock:Yes

.020" thick reinforced graphite. Fits front & rear. For 3-5/8" big bore applications. Note: See 977839 for S&S 3-5/8" head gaskets.
S&S

S&S, cylinder base gaskets. .020" graphite 3-5/8" big bore

#977840

Stock:Yes

Copper. Standard bore. Type 'B' gaskets
Cometic

Cometic cyl base gasket .010" copper

#561218

Stock:Yes

Front & rear gasket set. With one oil hole. .020" thick RCS (Rubber Coated Steel), an embossed steel core with a .001" thick coating of heat resistant nitrile rubber on both sides. OEM replacement reference 16776-63 (front) and 16777-63 (rear) gaskets.
Cometic

Cometic, cylinder base gasket set FR/RR. .020" RCS

#561641

Stock:Yes

Front & rear set. .020" thick fiber, a premium hi-temperature, hi-density creep resistant material that requires no re-torquing, no additional sealants, is fuel resistant and asbestos free. OEM replacement reference 16774-21 (old 46-21).
Cometic

Cometic, cylinder base gasket set FR/RR .020" fiber

#561678

Stock:Yes

Front gasket. .031" fiber, a premium hi-temperature, hi-density creep resistant material that requires no re-torquing, no additional sealants, is fuel resistant and asbestos free. OEM replacement reference 16776-63.
Cometic

Cometic, cylinder base gasket. Front. .031" fiber

#561680

Stock:Yes

Rear gasket. .031" fiber, a premium hi-temperature, hi-density creep resistant material that requires no re-torquing, no additional sealants, is fuel resistant and asbestos free. OEM replacement reference 16777-63.
Cometic

Cometic, cylinder base gasket. Rear. .031" fiber

#561682

Stock:Yes

Fits front & rear. .012" thick fiber, a premium hi-temperature, hi-density creep resistant material that requires no re-torquing, no additional sealants, is fuel resistant and asbestos free. OEM replacement reference 16774-57.
Cometic

Cometic, cylinder base gaskets FR/RR. .012" fiber

#561201

Stock:Yes

Copper. Standard bore. Type 'B' gaskets
Cometic

Cometic cyl base gasket .015" copper

#561219

Stock:Yes

Front gasket. .031" thick fiber, a premium hi-temperature, hi-density creep resistant material that requires no re-torquing, no additional sealants, is fuel resistant and asbestos free. OEM replacement reference 16776-63.
Cometic

Cometic, cylinder base gasket. Front. .031" Fiber

#561185

Stock:Yes

Front & rear gasket for one engine. .010" thick SLS (Single Layer Steel), a non-embossed steel core with a .001" thick coating of heat resistant nitrile rubber on both sides.
Cometic

Cometic, cylinder base gasket set. SLS 3-5/8" big bore

#561188

Stock:Yes

.032" Foamet (Foam Coated Metal) with a silicone bead. Final crush .025". James' Foamet gasket material has an aluminum core with a thin nitrile synthetic rubber foam layer bonded to both sides.
James Gaskets

James, cylinder base gasket set. .032" Foamet

#568832

Stock:Yes

.020" thick reinforced graphite. Fits front & rear. For standard 3-7/16" (1200cc) and 3-1/2" (1340cc) bore applications. Note: See 977852 for S&S head gaskets.
S&S

S&S, cylinder base gaskets. .020" graphite

#977854

Stock:Yes

.040" fiber reinforced paper with steel core. Final crush .031".
James Gaskets

James, gasket set cylinder base 3-5/8" big bore. .040" paper

#510748

Stock:Yes

'Type A'. Front & rear .020" thick fiber reinforced paper. Final crush .016". OEM replacement reference 16774-84A. Note: Type 'A' and 'B' Evolution base gaskets explained. There are 2 types of cylinder base gaskets for Evolution models available. For convenience sake we call them 'type A' (early style) and 'type B' (late style). - Type A' gasket: Was introduced on the 1984 Evolution Big Twin models, and can be used on all of the 84-99 1340cc Evo models and will follow the contours of the cylinder base perfectly. They will fit 86-22 Evo XL, but stick out at the cylinder base. This can be a problem with silicone beaded base gaskets. - Type B' gasket: Was introduced on Evolution XL Sportster models in 1986, and will fit all Evo XL models, but also all 84-99 Evo 1340cc models although the Big Twin cylinder base is a bit larger than the gasket. The 'type B' is the only gasket type that 'The Factory' supplied from 1986 onwards for both Evo Big Twin and Evo XL Sportster models. Both type 'A' and type 'B' have identical inner bore diameter, oil hole and stud hole locations. Gaskets for front & rear cylinder are identical. Only difference between the 'A' & 'B' gaskets is the outside perimeter.
James Gaskets

James, cylinder base gasket FR/RR. .020" paper

#503030

Stock:Yes

3-5/8" big bore. .031" thick Foamet (Foam Coated Metal). Final crush .025". James' Foamet gasket material has an aluminum core with a thin nitrile synthetic rubber foam layer bonded to both sides.
James Gaskets

James, gasket set, cylinder base 3-5/8" bore. .031" Foamet

#526198

Stock:Yes

Front & rear gasket for one engine. .020" thick SLS (Single Layer Steel), a non-embossed steel core with a .001" thick coating of heat resistant nitrile rubber on both sides.
Cometic

Cometic, cylinder base gasket set. SLS 4-1/8" big bore

#561566

Stock:Yes

'Type A' gasket. 3-13/16" big bore copper gasket. Type A gasket explained: The 'Type A' gasket is the early type introduced on the 1984 Evolution Big Twin models, and can be used on all of the 84-99 Evo Big Twin models and will follow the contoures of the cylinder base perfectly. They will fit 86-22 Evo XL, but stick out at the cylinder base. Both type 'A' and type 'B' have identical inner bore diameter, oil hole and stud hole locations. Gaskets for front & rear cylinder are identical. Only difference between the 'A' & 'B' gaskets is the outside perimeter.
Cometic

Cometic, cylinder base gasket. .020" copper 3-13/16" bore

#561216

Stock:Yes

Front & rear gasket for one engine. .010" thick SLS (Single Layer Steel), a non-embossed steel core with a .001" thick coating of heat resistant nitrile rubber on both sides.
Cometic

Cometic, cylinder base gasket set. SLS 4-1/8" big bore

#561494

Stock:Yes

Front & rear gasket for one engine. .020" thick SLS (Single Layer Steel), a non-embossed steel core with a .001" thick coating of heat resistant nitrile rubber on both sides.
Cometic

Cometic, cylinder base gasket set. SLS 4" big bore

#561493

Stock:Yes