S&S Cycle

PERFORMANCE REPLACEMENT CYLINDER HEADS FOR 31/2" AND 35/8" BORE FITMENT

COMPRESSION RATIO COMPARISON CHART Engine Size High Compression 76cc

• 1984–’99 big twins • Stock displacement • Stock bore strokers • Big bore engines up to 96" FEATURES AND BENEFITS • Compatible with stock or other flat topped pistons • Heads can be decked .060" if higher compression is desired • Port design increases flow, while maintaining velocity specifically designed for stock and small displacement engines • Compatible with up to .585" lift cams with TDC lifts of .252" intake and .210" exhaust • Stock diameter ports allows installation of original intake manifolds and exhaust 106-4570

S&S® Performance Replacement

LowCompression 82cc

Stock HD®

96" 89" 80"

10:1

9.5:1 8.9:1 8.4:1

9.75:1 9.25:1

9.4:1 8.8:1

8.5:1

FLOW COMPARISON CHART Cylinder Head Type Intake

Valve Diameter

.600" Lift Flow @ 10"

Exhaust

Intake

Exhaust

• Stock temperature sensor location for EFI equipped engines • High compression is 76cc, low compression is 82cc in chamber KIT CONTENTS • Two complete heads with valves and springs

Stock HD®

1.840"

1.610"

125cfm 98cfm

S&S Performance Replacement S&S® Super Stock®

1.900"

1.605"

142cfm 109cfm

2.000"

1.605"

158cfm 122cfm

PERFORMANCE REPLACEMENT CYLINDER HEADS Finish Low Compression 82cc*

GASKET KITS FOR S&S PERFORMANCE REPLACEMENT CYLINDER HEADS Bore Size Part # 31/2" 90-1905 35/8" 90-1906

High Compression 76cc

106-6059 106-6064

106-3466

Natural

Wrinkle Black 106-4570 16696-92A

Polished – DISCLAIMER:NOTLEGALFORSALEORUSE INCALIFORNIAONANYPOLLUTIONCONTROLLEDMOTORVEHICLE.NOTLEGALFOR SALEORUSENATIONWIDEONANYFEDERALPOLLUTIONCONTROLLEDMOTORVEHICLEUNDERTHECLEANAIRACT. *Used on V96 engines with flat top pistons 106-4575

NOTE: S&S recommends that all clearances be checked with high lift cams, especially if the heads have been decked to increase compression.

REPLACEMENT PARTS: SEE PAGE 82

SUPER STOCK™ CYLINDER HEADS FOR 31/2" AND 35/8" BORE FITMENT

90-1504

KIT CONTENTS • Complete head assembly with valves and S&S .650" lift springs ADDITIONAL PARTS (REQUIRED) Super Stock® Pistons 31/2" bore. . . . . . . . . . . . . . . . . . . . . . See PAGE 44 35/8" bore. . . . . . . . . . . . . . . . . . . . . . See PAGE 43 Gasket Kit. . . . . . . . . . . . . . . . . . . . . . . . See chart

• 1984–’99 big twin with 3 " or 35/8" bore (not compatible with stock or flat top pistons)

FEATURES AND BENEFITS • Machined with a stock bolt pattern • Larger, more open combustion chamber presents less resistance to air flow around the valves • 2.000" intake valves and 1.605" exhaust valves

• Special "cast to shape" intake ports with a special directional fin for improved air flow • Precision CNC machined from heat treated aircraft quality aluminum castings

REPLACEMENT PARTS: SEE PAGE 83

ASSEMBLED S&S® SUPER STOCK™ HEAD KITS Finish Part # Natural 90-1004 USA 1 Wrinkle Black 90-1504 USA 1 Polished 90-1091 USA 2

GASKET KITS FOR S&S SUPER STOCK™ CYLINDER HEADS Bore Size Part # 31/2" 90-1905 35/8" 90-1906

52 S&S Vintage 1926–1999 Order 608-627-1497