fits  17-24 M8 models with 4.25″ big bore cylinder kit

Can be used with Wiseco 576555 4.25″ big bore piston set. Will also fit most others fitted with 4.25″ cylinders.

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Home > Parts > Gaskets > Gasket Kits > Top End > Wiseco, 4.25″ big bore gasket kit

fits  18-24 Softail; 17-24 FLT/Touring; 17-24 Trikes. With water cooled heads, oil cooled heads must have oil drain plugs welded or plugged

EST (Extreme Sealing Technology). With MLS (Multi-Layer-Steel) .040″ thick head gaskets. The SLS (Single-Layer-Steel) cylinder base gaskets and SLS rocker cover gaskets used in these sets are .020″ thick and have .001″ of high temperature viton rubber coating on both sides. Kit comes with all gaskets, seals and o-ring for a complete top end rebuild. Note: Made with embossing for water cooled heads only. Note: Can be used up to 4.320″ bore without mods or plugging the water cooled heads. Note: Oil cooled heads must always be plugged or welded on cylinder bores exceeding 4.250″ since the oil cooling port is closer to the cylinder bore.

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Home > Parts > Gaskets > Gasket Kits > Top End > Cometic, EST top-end gasket kit. M8 4.320″ bore

fits  18-24 Softail; 17-24 FLT/Touring; 17-24 Trikes. With heads plugged or welded

EST (Extreme Sealing Technology). With MLS (Multi-Layer-Steel) .040″ thick head gaskets. The SLS (Single-Layer-Steel) cylinder base gaskets and SLS rocker cover gaskets used in these sets are .020″ thick and have .001″ of high temperature viton rubber coating on both sides. Kit comes with all gaskets, seals and o-ring for a complete top end rebuild. Note: No embossing on heads for water or oil cooling ports but for bore & oil drain only. Note: Heads must be plugged or welded in all cases.

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Home > Parts > Gaskets > Gasket Kits > Top End > Cometic, EST top-end gasket kit. M8 4.500″ bore

fits  18-24 Softail; 17-23 FLT/Touring; 17-18 Trikes. With 107″ engines (NU)

EST (Extreme Sealing Technology). With MLS (Multi-Layer-Steel) .040″ thick head gaskets. The SLS (Single-Layer-Steel) cylinder base gaskets and SLS rocker cover gaskets used in these sets are .020″ thick and have .001″ of high temperature Viton rubber coating on both sides. Kit comes with all gaskets, seals and o-ring for a complete top end rebuild. Fits Softail, Touring & Trike models with both oil cooled and water cooled heads. OEM replacement reference 25700729 gasket top end kit.

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Home > Parts > Gaskets > Gasket Kits > Top End > Cometic, EST top end gasket kit. M8 3.937″ bore

fits  18-24 (NU) Softail; 17-25 FLT/Touring; 17-25 Trikes. With 114″ engines

EST (Extreme Sealing Technology). With MLS (Multi-Layer-Steel) .040″ thick head gaskets. The SLS (Single-Layer-Steel) cylinder base gaskets and SLS rocker cover gaskets used in these sets are .020″ thick and have .001″ of high temperature viton rubber coating on both sides. Kit comes with all gaskets, seals and o-ring for a complete top end rebuild. Fits Softail, Touring & Trike models with both oil cooled and water cooled heads.

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Home > Parts > Gaskets > Gasket Kits > Top End > Cometic, EST top end gasket kit. M8 4.00″ bore

fits  18-24 (NU) Softail; 17-25 FLT/Touring (excl. 23-25 FLTRXSE; 24-25 FLTRXSTSE; 23-25 FLHXSE; 24-25 FLHX; 2025 FLHXU; 24-25 FLTRX); 20-22 FLHTCUTGSE Trike. With 117″ engines

With MLS (Multi-Layer-Steel) .040″ thick head gaskets. The SLS (Single-Layer-Steel) cylinder base gaskets and SLS rocker cover gaskets used in these sets are .020″ thick and have .001″ of high temperature Viton rubber coating on both sides. Kit comes with all gaskets, seals and o-ring for a complete top end rebuild. Fits Softail, Touring & Trike models with both oil cooled and water cooled heads. Note: 23-up Gen 2 M8 engines have Center Cooled heads, which will not fit these head gaskets. Note: OEM H-D 114″ has 4.016″ bore, OEM H-D 117/121″ have 4.075″ bore.

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Home > Parts > Gaskets > Gasket Kits > Top End > Cometic, EST top end gasket kit. M8 4.075″ bore

fits  18-24 Softail; 17-24 FLT/Touring; 17-24 Trikes. With 117″/121″ engines

EST (Extreme Sealing Technology). With MLS (Multi-Layer-Steel) .040″ thick head gaskets. The SLS (Single-Layer-Steel) cylinder base gaskets and SLS rocker cover gaskets used in these sets are .020″ thick and have .001″ of high temperature viton rubber coating on both sides. Kit comes with all gaskets, seals and o-ring for a complete top end rebuild. Fits Softail, Touring & Trike models with both oil cooled and water cooled heads.

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Home > Parts > Gaskets > Gasket Kits > Top End > Cometic, EST top end gasket kit. M8 4.125″ bore

fits  18-24 Softail; 17-24 FLT/Touring; 17-24 Trikes. With 120″ engines

EST (Extreme Sealing Technology). With MLS (Multi-Layer-Steel) .040″ thick head gaskets. The SLS (Single-Layer-Steel) cylinder base gaskets and SLS rocker cover gaskets used in these sets are .020″ thick and have .001″ of high temperature viton rubber coating on both sides. Kit comes with all gaskets, seals and o-ring for a complete top end rebuild. Fits Softail, Touring & Trike models with both oil cooled and water cooled heads.

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Home > Parts > Gaskets > Gasket Kits > Top End > Cometic, EST top end gasket kit. M8 4.185″ bore

fits  18-24 Softail; 17-24 FLT/Touring; 17-24 Trikes. With 121″ engines (excl. H-D 121″ VVT/HO)

EST (Extreme Sealing Technology). With MLS (Multi-Layer-Steel) .040″ thick head gaskets. The SLS (Single-Layer-Steel) cylinder base gaskets and SLS rocker cover gaskets used in these sets are .020″ thick and have .001″ of high temperature Viton rubber coating on both sides. Kit comes with all gaskets, seals and o-ring for a complete top end rebuild. Fits Softail, Touring & Trike models with both oil cooled and water cooled heads. Note: OEM H-D 117″ and 121″ engines come with a 4.075″ bore.

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Home > Parts > Gaskets > Gasket Kits > Top End > Cometic, EST top end gasket kit. M8 4.200″ bore

fits  18-24 Softail; 17-24 FLT/Touring; 17-24 Trikes. With both oil cooled and water cooled heads with bores up to 4.200″

EST (Extreme Sealing Technology). With MLS (Multi-Layer-Steel) .040″ thick head gaskets. The SLS (Single-Layer-Steel) cylinder base gaskets and SLS rocker cover gaskets used in these sets are .020″ thick and have .001″ of high temperature viton rubber coating on both sides. Kit comes with all gaskets, seals and o-ring for a complete top end rebuild. Note: Fits Softail, Touring & Trike models with both oil cooled and water cooled heads. The special design head & base gasket allows the gaskets to fit into the cylinder bore embossement… while even keeping the oil cooling port open on oil cooled heads. Note: With this gasket the 4.250″ big bore size is a true bolt-on application for both oil & water cooled M8 models.

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Home > Parts > Gaskets > Gasket Kits > Top End > Cometic, EST top-end gasket kit. M8 4.250″ bore