Product Details

Kit includes cams, gear cover gasket, cam bearings, and instructions. The 640 cam is designed for 95" or larger engines with compression ratios between 10.5:1 and 11.5:1 used in S&S 124" engines.

Experience has shown that the chain drive with hydraulic chain tensioners works well for all but the most demanding high performance applications. That's why S&S offers their most popular grinds in a chain drive version. The most obvious advantage to a chain drive cam set over their popular gear drive cams is the expense. When you replace the stock cams with an S&S chain drive cam set, all you are replacing are the cams. You re-use the stock cam drive components so you save money on parts. Saving money has always been a good idea, but never more so than it is today.

Valve Timing (in degrees)

• Intake Open: 25
• Intake Close: 60
• Exhaust Open: 65
• Exhaust Close: 25

Valve Duration (in degrees)

• Intake: 265
• Exhaust: 270

Valve Lift

• .640"

Centerline (in degrees)

• Intake: 107.5
• Exhaust: 110

Lift @ TDC

• Intake: .228"
• Exhaust: .214"

NOTE: Special valve springs will be needed, sold separately.

Fit Guide

Model

640C Chain Drive Camshaft Kit

Valve Lift

.640"

Intake Lift

.228"

Exhaust Lift

.214"

Intake Duration

265 degrees

Exhaust Duration

270 degrees

Intake Lobe Center

107.5 degrees

Exhaust Lobe Center

110 degrees

Intake Timing (Open)

25 degrees

Exhaust Timing (Open)

65 degrees

Intake Timing (Close)

60 degrees

Exhaust Timing (Close)

25 degrees

Product Fitment

This item fits the following applications: