S&S Cycle - S&S Performance Parts 2025 L - Volume 67

2017-UP

Phone: 608-627-1497

1 2017-UP 2 -2007-'17 3 -1999-'06 4 -1984-'99 5 -1936-'84 6 -XL-RA1250 7 -BELTS & GASKETS 8 -TOOLS 9 -WARRANTY 10 -APPENDIX

• Send your stock heads to S&S • Heads are CNC Ported, seats & guides replaced and assembled with new valves & springs • Ideal for Big bore 124” and bigger M8 engines • CNC machined ports for a consistent performance increase

• Great throttle response, high-velocity port without losing low RPM torque • 20% Increase in flow

Additional Information

• Both styles of heads can be ported, Twin-Cooled and oil-cooled • We deck the head gasket surface 0 010”, this gives an 87 7cc chamber volume which is the same as stock • The old seats and guides are removed and replaced with powder metal seats and guides (same material as our production heads) • New valves are installed, the intakes are stainless steel, the exhausts are Inconnel (improved high-temperature strength and durability) • Valve head diameter is +1mm over stock Valve stems are 6mm, same as stock • New valve stem seals/lower collars are installed with our 605” spring kit • Rocker arm studs with nuts included

CNC Head Porting Service for M8 Models Description CNC Head Porting Service for HD M8 Models

Part #

900-1012 FOR CLOSED COURSE COMPETITION USE ONLY. NOT INTENDED FOR STREET USE. LEGAL IN CALIFORNIA ONLY FOR RACING VEHICLES WHICH MAY NEVER BE USED, OR REGISTERED OR LICENSED FOR USE, UPON A HIGHWAY. NOT LEGAL FOR SALE OR USE NATIONWIDE ON ANY FEDERAL POLLUTION CONTROLLED MOTOR VEHICLE UNDER THE CLEAN AIR ACT.

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