SKU:11-0659
Oversize exhaust valve seat with a 1.405-inch port size and an outer diameter of approximately 1.75 inches, designed for Harley-Davidson XL engines from 1957 to 1966. This replacement seat is matched to the listed dimensions, ensuring an exact fit for reliable sealing and consistent engine performance.
Suitable for unleaded gasoline, the SB1750-4 supports modern fuel formulations without compromising compatibility with vintage cylinder heads. Made in the USA, it emphasizes durability and precision craftsmanship for long-term engine repairs and restoration projects.
Designed to restore or maintain engine efficiency during rebuilds, this oversize seat helps improve airflow and sealing in classic XL cylinder heads. It’s a purpose-built component for authentic restorations and performance-oriented rebuilds on 1957–1966 Harley XL models.
For optimal installation results, consider using the Cylinder Head Support Adapter Tool (16-0651) and oversize intake valve seats (11-0642 & 11-0643) as part of a professional overhaul procedure. This ensures a tight seal, smooth operation, and lasting reliability in vintage Harley engines.
Oversize exhaust valve seat has a 1.405 port size. Can be used with unleaded gas. Replacement size is actual size of seat which is supplied.The Motorshop SB1750-4 oversize exhaust valve seat is designed to provide precise fit and reliable performance for Harley Davidson XL models from 1957 to 1966. With a port size of 1.405 inches, this valve seat is suitable for use with unleaded gasoline, ensuring compatibility with modern fuel formulations. The actual seat size supplied is the same as the listed measurements, ensuring accurate replacement and consistent engine performance. Constructed in the USA, this valve seat offers high-quality craftsmanship and durability for long-lasting engine repairs. The outer diameter measures approximately 1.75 inches, making it an ideal replacement component for vintage Harley engines requiring oversize seating for optimal airflow and sealing. This part is essential for restoring or maintaining engine efficiency, especially when upgrading or rebuilding the cylinder head. The design and material of this valve seat help improve combustion efficiency while minimizing wear, making it suitable for both performance enhancements and routine maintenance. Proper installation ensures a tight seal and smooth operation, contributing to overall engine longevity and reliability. The SB1750-4 is compatible with a range of Harley Davidson XL models from the late 1950s through the mid-1960s, fitting seamlessly into the original cylinder head configurations. For optimal results, consider using accessory tools such as the Cylinder Head Support Adapter Tool (16-0651) and oversize intake valve seats (11-0642 & 11-0643) during installation or overhaul procedures. This comprehensive approach guarantees a professional-quality rebuild that maintains the authentic performance and appearance of your vintage Harley Davidson motorcycle.
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