Oversize valve seat replacement is required with 4.0.Final combustion chamber cc range 89-90 cc. Valves are + 2mm 42/34 intake / exhaust valves. This head has large increases in flow over the ST III and tightens the spread between Intake to Exhaust flow ratio with significant improvements to the exhaust port design. This is Zipper’s newest fully developed CNC ported head designed for larger output engines. Included are Upgraded Valve Springs and new guides.Ideal selection for use with S&S big bore kits (is this for only S&S Big Bore kits? Is it for SE kits as well?) Inductionįinal combustion chamber size range 89-90 cc valves sizes + 1.5mm intake 41.5/33 +1mm exhaust. This design has improved velocity helps make excellent early torque and peak HP.įor use on big bore M8 engines. Similar to the Stage 3 head, this fully developed CNC ported head has excellent flow that makes huge improvements required for large displacement M8 engines. Additional valve seat replacement may be required.Included are Upgraded Valve Springs and New Guides.Final combustion chamber cc range 92-93 cc. Use with an Oversize Induction module for best results. This head will support 150-160 HP in a variety of displacements with pump gas and exceeds O.E. Valves are + 1mm 41/33 intake and exhaust. Improved velocity helps make excellent early torque with stout peak HP.įor use on big bore M8 engines. M8 Stage 3- This is Zipper’s most popular fully developed CNC ported head with excellent flow that makes huge improvements to the inherently weak exhaust flow of the OE heads. Additional valve springs available for higher lift cams. Additional guide, valve, seat replacement may be required.This service is available for Oil Cooled- Twin Cooled heads.Exhaust ports are machined then heads are decked and fully assembled, ready for installation. The Stage 2 process offers superior sealing over the OE or SE heads. This is done to achieve power and concentricity without the cost of expensive porting and oversize valve options. After the seat integrity inspection is completed, the valves, seats and ports are professionally machined, un-shrouded and blended to provide maximum flow in an O.E. M8 Stage 2– Our Stage 2 head upgrade begins with an inspection of the seats, guides and valves. Zipper’s CNC Ported Milwaukee-Eight® Harley Cylinder Heads In addition the engine experts at Zipper’s can provide expert advice about camshaft and custom piston compatibly with each cylinder head choice you are considering We will be happy to answer any questions about each cylinder head option for your engine. Please keep this information handy as a reference guide. Zipper’s engineering and cylinder head experts are developing new heads faster than our web master can list on the web site. As the “Industry Original” we have been continuously developing new configurations for a wide variety of engine configurations to help you unlock the hidden potential of each specific engine build. Since 2000 Zipper’s has been offering Best in Class CNC ported Twin Cam Heads.
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