What kind of performance gains can I expect with this camshaft?

This 551C camshaft is designed to significantly improve low-end and midrange torque, making your engine feel stronger from idle up to around 4000 RPM. For the best results, it's recommended to pair it with a high-flow intake and exhaust system.

What compression ratio is this camshaft best suited for?

The 551C camshaft is best suited for engines with a compression ratio between 9:1 and 9.9:1. It is not recommended for compression ratios of 10:1 or greater.

Do I need to replace my valve springs and pushrods when installing this camshaft?

For 2005-2006 models, you may be able to reuse stock valve springs. However, due to the high lift of this camshaft, S&S Cycle recommends using their adjustable pushrods and potentially special high-lift springs for optimal performance and reliability.

S&S Cycle 551C Chain Drive Camshaft Kit 330-0002

Name: S&S Cycle 99-06 BT 551C Chain Drive Camshaft Kit
Brand: S&S Cycle
SKU: s-s-cycle-s-s-cycle-99-06-bt-551c-chain-drive-camshaft-kit-t14-663402
Price: 418.95 USD
Availability: BackOrder

S&S Cycle 99-06 BT 551C Chain Drive Camshaft Kit

$418.95

On Backorder

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 551C Chain Drive Camshaft Kit. Boosts low-end and midrange torque for 96-106 CID engines.

Key Features

Fits 1999-2006 Harley-Davidson Big Twin models.
Greatly improves low-end and midrange torque, strongest from idle-4000rpm.
Designed for engines with 96 to 106 CID and 9:1 to 9:9 compression.
Valve lift is 0.550" intake and 0.550" exhaust.
Duration at 0.053" is 216º intake and 238º exhaust.
Quick installation, reusing many stock components.

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Will this fit your vehicle?

Product Details

S&S Cycle is well-known for making performance parts for Harley-Davidson motorcycles. This 551C Chain Drive Camshaft Kit is a popular choice for riders looking to get more out of their Big Twin engines from 1999 to 2006. It’s designed to give you a noticeable improvement in low-end and midrange torque, making the bike feel stronger from idle up to around 4000 RPM. This kit is a solid option for engines in the 96 to 106 cubic inch range with a compression ratio between 9:1 and 9.9:1.

The 551C camshaft features a valve lift of 0.550 inches on both the intake and exhaust sides, with a duration of 216 degrees for the intake and 238 degrees for the exhaust at 0.053 inches lift. These specs mean it's designed to take advantage of better airflow, whether you have ported stock heads or S&S Super Stock heads. While it's a bolt-in cam for many 2005-2016 engines, it's important to note that its higher lift means it's not recommended for compression ratios above 10:1. For 2005-2006 models, you can often reuse your stock valve springs, but for other applications, you might need special high-lift springs. S&S adjustable pushrods are also recommended due to the cam's high lift, and for the best overall performance gains, consider pairing this kit with a high-flow intake and exhaust system.