Sierra 18-1277 Head Gasket Set for Mercruiser 470, 485, and 488 Engines

The Sierra 18-1277 Head Gasket Set is a complete engine gasket kit built for Mercruiser 470, 485, and 488 stern drive engines. Rather than a single-piece gasket, this is a full kit designed to cover an engine rebuild or major service, pairing a head gasket with the intake, exhaust, valve cover, and carburetor base gaskets plus a full set of valve stem seals, so an installer is not stuck sourcing individual gaskets separately. The kit uses a generic-type gasket design that is common across engine brands, allowing the same short block and valve grind gasket sets to be used with different exhaust manifold gasket kits depending on the application, which helps consolidate the parts needed to keep on hand for these engines.

Inside the kit are six distinct components: an intake manifold gasket, a carburetor base gasket, a head gasket, eight valve stem seals, a valve cover gasket, and an exhaust manifold gasket. This gives a rebuilder the core sealing components needed for the top end of the engine in one kit. The set is finished in white and is sold as a single kit (1 count).

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-1277
• Product Type: Head Gasket Set
• Color: White
• Weight: 0.87 pounds
• UPC: 808282233808
• Unit Count: 1 kit
• Kit Contents: 1 intake manifold gasket (18-0158), 1 carburetor base gasket (18-2848), 1 head gasket (18-3878), 8 valve stem seals (18-4023), 1 valve cover gasket (18-0685), 1 exhaust manifold gasket (18-0956-1)

Fitment

• Mercruiser 470, 1976-82
• Mercruiser 470, 1983-84
• Mercruiser 485, 1980-82
• Mercruiser 488, 1983-84

Frequently Asked Questions

What engines does the Sierra 18-1277 Head Gasket Set fit? It fits Mercruiser 470 engines built 1976-82 and 1983-84, Mercruiser 485 engines built 1980-82, and Mercruiser 488 engines built 1983-84.

What is included in the 18-1277 Head Gasket Set? The kit includes one intake manifold gasket (18-0158), one carburetor base gasket (18-2848), one head gasket (18-3878), eight valve stem seals (18-4023), one valve cover gasket (18-0685), and one exhaust manifold gasket (18-0956-1).

How much does the 18-1277 Head Gasket Set weigh? The Sierra 18-1277 Head Gasket Set weighs 0.87 pounds.

What color is the 18-1277 Head Gasket Set? This gasket kit is white.

Does the 18-1277 kit include head bolts? No, the Sierra 18-1277 Head Gasket Set contains gaskets and valve stem seals only; head bolts are not among the six components in the kit.

How many valve stem seals come in the 18-1277 kit? Eight valve stem seals (part 18-4023) are included in the Sierra 18-1277 Head Gasket Set.

Is the 18-1277 gasket set made by Sierra? Yes, part number 18-1277 is manufactured by Sierra as a complete head gasket set.

Can the 18-1277 exhaust manifold gasket be swapped for a different exhaust configuration? Yes, the Sierra 18-1277 kit uses the same short block and valve grind gasket sets that can be paired with different exhaust manifold gasket kits depending on the specific application.

Is this a single gasket or a full kit? The Sierra 18-1277 is a full head gasket set with six components, not a single gasket, covering the intake, head, valve cover, carburetor base, valve stems, and exhaust manifold.

How many units come in one order of 18-1277? Each order of the Sierra 18-1277 Head Gasket Set is one complete kit (1 count).