Magnus Engine Main Bolt Washers for McLaren V8 M838/M840

Magnus Motorsports engine main bolt washer set for McLaren V8 M838/M840 are designed specifically for the OEM-style main bolt configuration, ensuring proper oil sealing while maintaining correct fastener preload.

Vehicle Fitment:
• All McLaren V8 Engines
• Professional installation recommended

Purchase Includes:
(10) Large Washers
(10) Small Washers

More from Magnus:
These washers are manufactured to exact factory specifications and are a direct replacement for the original main bolt sealing washers. Their bonded construction prevents oil migration around the main bolts, eliminating the leakage issues that can occur when using stud conversions or worn OEM washers.

Used exclusively in our 1300hp+ crate engine programs, these sealing washers are proven in extreme track and high-power applications while requiring no block modification. When paired with main bolts as originally intended by the manufacturer, they provide reliable sealing, consistent clamping, and long-term durability under high load conditions.

Features:
• Direct fit for all McLaren V8 engines
• Designed for high-boost and motorsport use
• Precision manufactured and race tested