What is the difference between gear drive and chain drive camshafts?

Gear drive camshafts use a direct gear-to-gear connection between the camshaft and the crankshaft, offering more precise timing and eliminating potential slack from a chain drive. This can lead to a more responsive engine feel and consistent valve timing.

Do I need to replace my valve springs when installing this kit?

For 1999-2004 Harley-Davidson Big Twin models, special springs are required as these cams are not a direct bolt-in. For 2005-2006 models (excluding the 2006 HD Dyna), these cams are a bolt-in and can use the stock springs.

What engine sizes and compression ratios is this camshaft kit optimized for?

This 585G camshaft kit is designed for 88 to 95 cubic inch engines with compression ratios from 10:1 to 10.5:1. It is also suitable for 100 to 107 cubic inch engines operating at 9.7:1 to 10.5:1 compression.

Specifications

Brand: S&S Cycle
Part #: 33-5179
UPC: 33-5179

S&S Cycle 99-06 BT Gear Drive 585G Camshaft Kit

Name: S&S Cycle 99-06 BT Gear Drive 585G Camshaft Kit
Brand: S&S Cycle
SKU: s-s-cycle-s-s-cycle-99-06-bt-gear-drive-585g-camshaft-kit-t14-663413
Price: 948.95 USD
Availability: BackOrder

$948.95

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 99-06 BT Gear Drive 585G Camshaft Kit. This kit includes everything needed to upgrade your Harley-Davidson Big Twin's camshafts for improved performance.

Key Features

Fits 1999-2006 Harley-Davidson Big Twin models (except 2006 HD Dyna).
Includes 585G gear drive camshaft set, inner gears, outer cam drive gear kit, and camshaft installation kit.
Designed for 88-95 inch engines with 10:1 to 10.5:1 compression, and 100-107 inch engines with 9.7:1 to 10.5:1 compression.
Features 0.585" valve lift on both intake and exhaust.
Intake duration at 0.053" is 245 degrees; exhaust duration is 260 degrees.
Gear drive design offers precise timing and improved responsiveness.

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Will this fit your vehicle?

About this part

Product Details

If you're looking to get more out of your Harley-Davidson Big Twin engine, the S&S Cycle 585G Gear Drive Camshaft Kit is a solid option. This kit is designed for 88 to 95 cubic inch engines with compression ratios between 10:1 and 10.5:1, and also works well for 100 to 107 cubic inch engines at 9.7:1 to 10.5:1 compression. It's a comprehensive package that includes the 585G gear drive camshaft set, inner and outer cam drive gears, and a complete camshaft installation kit, making it a convenient choice for a significant engine upgrade.

The 585G camshaft itself features a valve lift of 0.585 inches on both the intake and exhaust sides, with a duration at 0.053 inches of 245 degrees for the intake and 260 degrees for the exhaust. The timing events are set at Intake 20º Open / 45º Closed and Exhaust 60º Open / 20º Closed. This specific grind is known for its strong performance in the mid-range and top end, offering a noticeable improvement in power delivery. Gear drive cams like these offer more precise timing and eliminate the chain drive slack you might find with stock setups, leading to a more responsive feel.

Installation details vary slightly depending on the model year. For 1999-2004 Harley-Davidson Big Twin models, special springs are required, and the cams are not a direct bolt-in. However, for 2005 and 2006 models (excluding the 2006 HD Dyna), these cams are a bolt-in installation and can utilize the stock springs, simplifying the process. This kit fits a wide range of Harley-Davidson models, including the Road King, Electra Glide, Heritage Softail, Fat Boy, and Dyna Super Glide, among others from 1999 to 2006.