What material is this base gasket made from?

This S&S Cycle base gasket is made from graphite. Graphite is a common material for engine gaskets because it can withstand high temperatures and pressures, helping to maintain a good seal.

What does the bore size and thickness mean for my engine?

The 3-5/8 inch bore size needs to match your engine's cylinder bore for a proper seal. The 0.018 inch thickness is a specific measurement that ensures the correct compression ratio and sealing surface when installed.

Why does this gasket come in a 2-pack?

The 2-pack provides you with two identical base gaskets. This is useful if you are working on a V-twin engine that requires two gaskets, or it gives you a spare for future maintenance needs.

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Trusted Since 1957

Est. 1957

Specifications

Brand: S&S Cycle
Part #: 930-0093
UPC: 930-0093

S&S Cycle 84-99 BT 0.18in 3-5/8in Base Gasket - 2 Pack

Name: S&S Cycle 84-99 BT 0.18in 3-5/8in Base Gasket - 2 Pack
Brand: S&S Cycle
SKU: s-s-cycle-s-s-cycle-84-99-bt-0-18in-3-5-8in-base-gasket-2-pack-t14-662506
Price: 17.13 USD
Availability: BackOrder

$17.13

On Backorder — Expected to ship by May 7, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

S&S Cycle 84-99 BT 0.18in 3-5/8in Base Gasket - 2 Pack. Graphite construction for reliable sealing.

Key Features

Fits 1984-1999 Big Twin (BT) engines.
Gasket measures 0.018 inches thick.
Features a 3-5/8 inch bore size.
Constructed from graphite for reliable sealing.
Comes as a 2-pack.

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About this part

Product Details

S&S Cycle is well-known for making performance engine parts for Harley-Davidson motorcycles. This base gasket is a good example of their focus on reliable engine components. It's designed to seal the base of your engine, ensuring proper compression and preventing leaks.

This gasket measures 0.018 inches thick and has a 3-5/8 inch bore, which is important for matching the cylinder bore size on your Big Twin engine from 1984 to 1999. The graphite material is a solid choice for this application because it can handle the heat and pressure found in the engine's base area, providing a consistent seal over time.

You get two gaskets in this pack, so you'll have a spare on hand or enough for a twin-cylinder setup. It's a straightforward part that does its job well.