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

1936-'84

www.sscycle.com

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

90-1496

Fitment • 1966–‘84 big twins • SH-Series engines Features and benefits • Stock appearance and improved performance • S&S 590" lift valve springs • Fits stock intake manifolds and exhaust pipes • Rocker cover fastened with 5/16"-18 hex-head cap screws

Options • Stock bore or 35/8" bore • O-ring or rubber band style manifold • Natural aluminum or wrinkle black powder coat finish • Dual spark plugs and/or external oil return lines by special order Kit Contents • Front and rear assembled cylinder heads complete with valves and 590" springs

• Head, rocker and exhaust gaskets • Mounting hardware and instructions

Cylinder Head Kits For 1966–'84 Big Twin Engines Engine Year and Type Bore

Aluminum Finish

Wrinkle Black

Stock

90-1496 90-1497 90-1491 90-1498 90-1499 90-1488 90-1490*

90-1596 90-1597

1966–'78 (O-ring)

35/8"

35/8" Dual Plug

–

Stock

90-1598

1979–'84 (Band)

35/8"

– –

35/8" Dual Plug

Special Order* 90-1490* *Use this special order part number to order assembled or unassembled cylinder heads with spring options, and special finish. Front or rear heads available by special order. Download the Special Order Form at sscycle.com/soforms NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLE. NOT LEGAL FOR SALE OR USE NATIONWIDE ON ANY FEDERAL POLLUTION CONTROLLED MOTOR VEHICLE UNDER THE CLEAN AIR ACT. Specify

Fitment • S&S KN-Series and 1936–'47 HD® OHV Engines Features and benefits • Stock bore • Black powder coat finish Options • Fully-assembled bolt-on kit or unassembled kits available Kit Contents • Front and rear headss • Mounting hardware and instructions KN-Series Head Kits For Big Twin Engines Engine Year and Type

Bore Stock Stock

Part #

1936–'47 KN-Series Head Kit - Fully-Assembled

900-1300 900-1305

1936–'47 KN-Series Head Kit - Unassembled (Heads with seats and valves)

5-20