WebWelcome to HD Street Performance, formerly Head Designs by Dewey We are dedicated to performing head porting and supplying engine packages for HD motorcycles. Our goal is … WebThese ThunderSport heads will allow your Sportster® engine to reach its full potential! • Full CNC port & combustion chamber machining • Ductile iron step-lock valve guides with Viton seals • Competition seat work on Serdi equipment • 1.900” Intake, 1.615” Exhaust stainless steel valves • Performance valve springs with titanium collars
Harley Cylinder Heads - Dennis Kirk
WebThe M8 Street Fighter head is the perfect entry level head for the customer looking for an upgraded performance head while still being able to use some of their stock components. … WebOur entry-level performance head is for the customer who is looking for an increase in horsepower and torque while working with existing stock components. This head is … iof web tv
Twin Cam Head Porting Packages - HD Street Performance
WebStock Harley heads aren't necessarily bad, but they do suffer from the imperfections associated with mass production. Intake and exhaust ports are left with very rough surfaces from mass... WebImproving on the First Generation of CNC-Ported Milwaukee-Eight Cylinder Heads, the Screamin' Eagle team refined the intake and exhaust ports to maximize the flow of high-velocity air through the 1mm larger valves of 128CI and 131CI engines and fully machined the combustion chamber to optimize combustion efficiency. WebGive your CNC ported heads all the air they want with an S&S performance carburetor or throttle body. Carburetors depend on air velocity to deliver fuel, so while you want something bigger, too large a carb will hurt low rpm response. We generally recommend the 17/8" S&S Super E Carb for 97" engines. However, on the drag strip, the 21/16" S&S ... iof wco