Cylinder Head and Base Gasket Kits for 124" and 128", oil-cooled or water-cooled models, with 4.25" Big Bore Cylinders. This is a strictly bolt-on kit, as the special gaskets eliminate the need to weld and modify oil or water passages. Gasket kits are available with either .030" or .040" thick gaskets . The Cylinders are offered in a factory-style black texture finish with highlighted fins. Cast-iron liners ensure strength, durability and quiet operation.

Features and Benefits

• Made in USA
• Multi-Layer Steel construction for excellent heat and pressure resistance
• Sized specifically 4.25" big bore M8 applications
• Thickness range .030 -.014 to fine-tune compression and gasket stack

• Made in USA
• Multi-Layer Steel construction for excellent heat and pressure resistance
• Sized specifically 4.25" big bore M8 applications
• Thickness range .030 -.014 to fine-tune compression and gasket stack

Please note that this information serves as a fitment guide only. For specific fitment questions or clarifications, please contact us, as manufacturers may introduce variations and modifications during model year or regional revisions. While we strive to provide accurate data, fitment details may vary by region; therefore, compatibility outside the listed region and submodel variant cannot be guaranteed.