The Revolution Performance 1.85 XL/Buell cylinder heads are a product of countless hours of physical research and development to produce not only big torque but reliable, broad power delivery. Ports are developed using state of the art Superflow 600 flowbench technology and port flow analysis software as well as real world know how to bring a perfect union of volume and velocity. What does this mean for the customer? BIG torque! Let¹s face it, the real world is not full of dyno shootouts where mostly unusable high end horsepower is key.

All heads are upgraded to one piece severe duty stainless steel 1.850" intake and 1.615" exhaust valves. All valve profiles are cut using the latest in Sunnen seat and guide machine technology. Valve guides are replaced with bronze manganese units for the utmost in durability and heat dissipation along with Viton rubber valve guide seals. Valve springs are replaced with superior quality chromium silicon units with lightweight Titanium retainers and 10 degree valve locks. This is the bench mark cylinder head for early as well as broad power delivery and excellent “long haul” durability!

This cylinder head is the “no holds barred” big torque and horsepower piece. If you are looking to build the torque monster of your dreams, big inch cruiser, or high revving street killer then this is the head for you. If the description sounds diverse that¹s because they are. These cylinder heads are prepared for you based upon your exact engine combination so that your performance goals are met. When you are trying to achieve a specific power or characteristic goal an “off the shelf” cylinder head will not do. All components are replaced with the very best that the valve train industry has to offer.

Severe duty 1.900" intake valves along with 1.615" high tulip exhaust valves are installed and heights are blueprinted. OEM valve seats are replaced with high quality cast alloy units. Chromium Silicon valve springs are used for the utmost in stability and reliability as well as light weight Titanium retainers and high performance 10 degree valve locks. Lastly, valve guides are replaced with bronze manganese units for unsurpassed heat dissipation. These heads have generated well over 120 rwhp at 1250cc’s and 130+ rwhp at 88" on pump gas when properly equipped with a few of our other fine components!