The Howards Cams 114413-12S Big Bottle Mechanical Roller Camshaft is engineered for high-compression Small Block Chevy engines that require strong mid- to upper-RPM torque and horsepower. Featuring Howards Big Bottle lobe technology and a 4/7 swap firing order, this camshaft is designed to improve crankshaft harmonics, reduce main bearing loading, and deliver consistent performance in aggressive street/strip and race applications.

Howards Cams 114413-12S Features:

• Big Bottle mechanical roller camshaft for high-RPM stability and power
• 4/7 swap firing order improves crankshaft loading and power balance
• Designed for Chevy Small Block engines from 262–400 ci
• Operating range from 3800–7800 RPM
• Intake lift .640 in. with 1.5:1 rocker arms
• Exhaust lift .645 in. with 1.5:1 rocker arms
• Duration @ .050 in.: 263 degrees intake / 273 degrees exhaust
• Advertised duration: 295 degrees intake / 305 degrees exhaust
• 112-degree lobe separation angle
• 108-degree intake centerline
• Small base circle design for mid- and upper-RPM torque and power

Howards Cams 114413-12S Notes:

• Valve lash set at .022 in. intake and .022 in. exhaust
• Requires compression ratio of 12.5:1 or higher
• Stock OEM valve springs cannot be used
• Requires thrust button for proper camshaft control
• Requires upgraded distributor gear and fuel pump pushrod
• Ignition firing order must be changed to 1-8-7-3-6-5-4-2

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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