EMPI AS41 Magnesium Engine Case | VW Type 1 Air-Cooled | Stock 85.5mm Bore, 8mm Studs (98-0431-B)

EMPI AS41 Magnesium Alloy Engine Case — Stock 85.5mm Bore (98-0431-B)

The case is the foundation every air-cooled build sits on, and EMPI's AS41 magnesium case (98-0431-B) is the all-new, stock-spec replacement for a cracked, line-bored, or worn-out original. Same lightweight AS41 magnesium alloy the factory used on late Type 1 engines, cast fresh — not a used core hoping to survive another rebuild.

Vehicle Fitment

• VW Beetle: 1966–1979
• VW Super Beetle: 1971–1979
• VW Karmann Ghia: 1966–1974
• VW Type 3: 1966–1973
• VW Bus: 1966–1979

Confirmed for VW Type 1 1200–1600cc stock-displacement builds; accepts stock 85.5mm cylinders and 8mm case studs. Not for big-bore 90.5/92/94mm builds or Type 4 engines.

Key Features & Benefits

• All-new AS41 magnesium alloy casting: the lightest production-spec case material
• Stock 85.5mm bore and standard main bearing size: a true stock rebuild foundation
• Dual-relief oiling, 8mm case-stud threads: universal stock configuration
• Brand-new machining throughout: cam tunnel, main saddles, lifter bores
• Eliminates a fatigued core: no risk of building on a multiple-time-rebuilt case

Technical Specifications

• Material: AS41 magnesium alloy, new casting
• Bore: Stock 85.5mm
• Studs: 8mm
• Relief: Dual
• Main bearing: Standard size
• Part Number: 98-0431-B
• UPC: 707924368109
• Country of Origin: Brazil
• Shipping weight: 27 lb

Frequently Asked Questions

• Is this a new case or a rebuilt core? All-new casting — not a used core.
• What bore does it take? Stock 85.5mm cylinders; it is not bored for big-bore barrels.
• Aluminum or magnesium? AS41 magnesium alloy — lighter than aluminum, the factory late-model material.
• What stud size? 8mm case studs, dual relief.
• What's the part number? EMPI 98-0431-B (UPC 707924368109).

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Engine Parts Engine All VW Air-Cooled

Prop 65 Warning

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and reproductive harm. For more information, go to www.P65Warnings.ca.gov.