What is the primary function of an exhaust valve in an engine?

The exhaust valve opens to allow burnt gases to exit the combustion chamber after the power stroke. It then seals the chamber during the intake, compression, and power strokes to maintain compression and prevent blow-by.

What does the 'BT' designation mean in the product description?

The 'BT' designation typically refers to 'Big Twin,' indicating that this valve is designed for Harley-Davidson's larger displacement V-twin engines, specifically those from 1984 to 1999 as noted.

Does this exhaust valve come with any installation hardware?

This listing is for the exhaust valve only. Installation hardware, such as valve springs, seals, or retainers, is typically sold separately and should be checked against your specific engine's requirements.

S&S Cycle Exhaust Valve 1.605in x 4.428in 90-2001

Name: S&S Cycle 84-99 BT 1.605in x 4.428in Exhaust Valve
Brand: S&S Cycle
Price: 82.80 USD
Availability: InStock

S&S Cycle 84-99 BT 1.605in x 4.428in Exhaust Valve

$82.80

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 1.605in x 4.428in Exhaust Valve

Key Features

Fits 1984-1999 Harley-Davidson Big Twin engines.
Measures 1.605 inches in diameter and 4.428 inches in length.
Designed to handle high exhaust temperatures and pressures.
Ensures proper sealing for efficient gas flow.
A key component for maintaining engine compression and power.
Built to S&S Cycle standards for reliable performance.

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Will this fit your vehicle?

Product Details

This exhaust valve measures 1.605 inches in diameter and 4.428 inches in length, a specific size chosen for optimal performance in certain engine builds. It's designed to handle the high temperatures and pressures found in the exhaust port, ensuring it seals properly and allows for efficient gas flow when needed. When you're rebuilding the top end of your engine, especially for a Harley-Davidson Big Twin from 1984 through 1999, a well-made exhaust valve is crucial for maintaining compression and power.

S&S Cycle has been a well-known name in performance V-twin engines for a long time. This exhaust valve is built to their standards, meaning it's a solid option for riders who want reliable performance. Proper valve seating is key to how your engine runs, and this part is made to fit right and function as intended, helping your engine breathe correctly.

This valve is designed to fit a wide range of Harley-Davidson models, including popular bikes like the Electra Glide, Road King, and Street Glide. If you're working on one of these machines and need to replace an exhaust valve, this is a component you can count on to get the job done.