CMS A-Series Fast Road/Rally Camshaft – BMC 544 Profile Equivalent
Precision In-House Engineering for the BMC A-Series Engine
Equip your competition or high-performance street build with the legendary BMC 544 profile, originally engineered during the golden age of classic British motorsport
The BMC 544 (historically sharing an identical profile with the famous factory Formula Junior race grind, the C-AEG-643) is a true performance favorite for classic Mini engine builders. The 544 bridges the gap between aggressive fast road tuning and historic stage rallying. It delivers a hard-charging, thrilling top-end power band from 2,500 to 7,500 RPM. Because it is designed to thrive at higher revs, it will yield a sporty, notable racing idle.
Technical Specifications:
- Application: Fast Road / Historic Rally
- Power Band: 2500–7500 RPM
- Cam Lift: 7.77mm (0.306") Inlet / Exhaust
- Valve Lift: 9.85mm (0.388") Inlet / Exhaust (with standard 1.25:1 rockers)
- Advertised Duration: 288° Inlet / 288° Exhaust
- Full Lift: 110° ATDC (Inlet)Overlap: 73°
- Valve Clearance (VC): 0.40mm (0.016") Inlet / Exhaust
The CMS Core Exchange Service
This profile is precision-ground onto an original, inspected factory A-Series core. To purchase this camshaft, you can either:
First Option: Ship your original, clean A-Series camshaft to our workshop. Once it passes our strict structural integrity and gear wear inspection, we will dispatch your new CMS performance cam.
Second Option: Pay an upfront core surcharge at checkout. We will ship your CMS camshaft immediately, and refund the deposit in full once your usable exchange core arrives at our shop and passes inspection.Installation & Break-In Requirements
To ensure the longevity of your flat-tappet A-Series valvetrain, CMS requires the following installation steps. Failure to follow these steps will void the product warranty:
Mandatory New Followers: Never install a new or reground camshaft with used lifters. You must use brand-new, high-quality flat-tappet followers.
Check Valvetrain Geometry: Because this is a high-velocity regrind with a slightly reduced base circle, you must check rocker arm geometry. Ensure adjustment screws have proper thread engagement. Rocker pedestal shims may be required to restore a perfect 90-degree alignment.
Break-In Procedure: Coat all lobes and follower faces heavily with high-zinc ZDDP assembly paste. Upon initial startup, do not idle the engine. Run the engine immediately at 2000 to 2500 RPM for 20 minutes to work-harden the new lobe surfaces.Trademark Disclaimer
Classic Machine Shop CMS is an independent manufacturer of precision-ground engine components. Any reference to original manufacturer names, profile designations, or original part numbers is strictly for informational and comparative purposes to describe the physical geometric dimensions of the lobe profile. Classic Machine Shop has no official affiliation with these trademark holders.
