AA 501 Class 11 Racing Cylinder Head

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1384 AA 501 Series Cylinder Head – SCORE / SNORE Class 11 Approved – 85.5mm (each)

AA 501 Class 11 Racing Cylinder Head | CB Performance

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Product Code: 1384

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Description

AA 501 Series Performance Cylinder Head – SCORE / SNORE Class 11 Approved

Built for the demands of competitive off-road racing, CB Performance's AA 501 Series cylinder head is specifically assembled for SCORE and SNORE Class 11 (Stock Bug) competition.

Starting with the AA Performance Products 501 Series aluminum casting, CB Performance equips each head with SUPERGRIP™ 35.5mm stainless steel intake valves, 32mm stainless steel exhaust valves, dual valve springs, single-groove SUPERGRIP™ keepers, and lightweight titanium valve retainers.

The titanium retainers reduce valve train weight, helping improve valve control at higher RPM. Combined with dual valve springs, this configuration is designed to support the demands of sustained off-road racing.

The AA 501 casting features a modernized combustion chamber, additional cooling-fin material, reinforced rocker stud bosses, and increased material around the intake ports. The intake and exhaust ports and combustion chambers retain their original AA configuration, with no porting or chamber modifications performed by CB Performance.

Approved as-built for SCORE / SNORE Class 11 (Stock Bug) racing. Available exclusively for standard 85.5mm cylinder bores.

Sold individually (each). These cylinder heads are supplied in one standardized racing configuration. No alternate valve sizes, bore sizes, or custom modifications are available.

AA Performance Products 501 Series aluminum casting (031 CH 501)
Assembled by CB Performance for SCORE / SNORE Class 11 (Stock Bug) racing
Engine Application: Air-cooled VW Type-1
Cylinder Bore: Standard 85.5mm only
Intake Valves: 35.5mm S/S SUPERGRIP™
Exhaust Valves: 32mm S/S SUPERGRIP™
Valve Stem Diameter: 8mm
Valve Springs: Dual
Valve Keepers: SUPERGRIP™
Valve Retainers: Lightweight titanium for reduced valve train mass and improved high-RPM valve control
Combustion Chambers: Original AA configuration (55cc), unmodified by CB Performance
Intake & Exhaust Ports: No porting or polishing performed by CB Performance
Spark Plugs: 12mm diameter, 3/4" reach
Quantity: Sold individually (each)
Configuration: Fixed specifications; no custom modifications available
Original Casting: AA Performance Products 501 Series

Approval for other racing classes has not been verified.
Racers should verify current sanctioning-body and event regulations before competition.
Check combustion chamber volume, compression ratio, piston-to-valve clearance, and valve train geometry during engine assembly.
Confirm compatibility of camshaft lift and rocker arm geometry with the supplied valve springs.

Accessory Parts

2800 Graphite Compression Gaskets - 1 5/16" Stock Exhaust (set of 4) Torque to 10 - 12 ft. lbs

2720 Intake Gasket - fits Dual Port Round Port

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