What is the recommended setup for this camshaft kit?

For optimal performance and longevity, S&S Cycle highly recommends upgrading to an S&S oil pump and cam support plate. Additionally, a stock 2007 and later style hydraulic cam chain tensioner is advised for chain drive cams.

Can I use my stock valve springs with this camshaft?

Yes, stock valve springs from 2005-2006 Harley-Davidson engines can be used with the MR103C and HP103 cams. However, for maximum performance, other components may need consideration.

What other modifications are recommended to get the most out of this camshaft?

To achieve the maximum performance increase from this MR103C camshaft, S&S Cycle recommends pairing it with performance intake and exhaust systems.

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Specifications

Brand: S&S Cycle
Part #: 330-0456
UPC: 330-0456

S&S Cycle 99-06 BT MR103C Chain Drive Camshaft Kit

Name: S&S Cycle 99-06 BT MR103C Chain Drive Camshaft Kit
Brand: S&S Cycle
SKU: s-s-cycle-s-s-cycle-99-06-bt-mr103c-chain-drive-camshaft-kit-t14-663429
Price: 418.95 USD
Availability: BackOrder

$418.95

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 MR103C Chain Drive Camshaft Kit. Delivers more torque and horsepower for modified engines.

Key Features

Fits 1999-2006 Harley-Davidson Big Twin models (excluding '06 Dyna).
Intake valve lift is 0.585 inches and exhaust valve lift is 0.585 inches.
Intake duration at 0.053 inches is 226º, and exhaust duration is 252º.
Intake timing opens at 13º and closes at 33º; exhaust timing opens at 50º and closes at 22º.
Designed for modified engines with larger displacement and higher compression.
Stock valve springs from 2005-2006 engines can be used.

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About this part

Product Details

With an intake valve lift of 0.585 inches and an exhaust valve lift of 0.585 inches, this S&S Cycle MR103C chain drive camshaft kit is built for modified engines looking for a significant boost in performance. It's designed to provide more torque and horsepower than typical bolt-in cams, making it a solid choice for those with larger displacement or higher compression setups. This kit is compatible with a wide range of Harley-Davidson Big Twin models from 1999 through 2006, including popular bikes like the Road King, Heritage Softail, and Dyna Super Glide.

The MR103C camshaft features specific timing points, with intake opening at 13º and closing at 33º, and exhaust opening at 50º and closing at 22º. The duration at 0.053 inches is 226º for the intake and 252º for the exhaust, contributing to its enhanced performance characteristics. While stock valve springs from 2005-2006 engines can be used, S&S Cycle strongly recommends upgrading to an S&S oil pump and cam support plate, along with a 2007-and-later style hydraulic cam chain tensioner, for optimal performance and longevity with chain drive cams.

For maximum performance gains from this camshaft, pairing it with performance intake and exhaust systems is recommended. Keep in mind that this part is not CARB approved and cannot be shipped to California.