S&S Cycle

CYLINDER HEAD REPLACEMENT PARTS FOR 1936–'47 KNUCKLEHEADS AND KN-SERIES ENGINES

20. Washer, Lock, 7/16", Zinc . . . . . . . . . . . . . . . . 106-4357 21. Washer, packing 1936-'47 OHV BT 17482-36 . . . . . . . . 106-4358 22. Seal, rocker arm, 1936-’47 OHV BT 17475-38 . . . . . . . . 106-3636 23. Rocker arm, non-roller, 1:1 ratio, 1936-'47 OHV BT; KN-Series (Includes shaft kit) Set of four. . . . . . . . . . . . . . 106-2412 Front Intake w/shaft . . . . . . . . . . . . . . . . . . 106-2862 Front Exhaust w/shaft. . . . . . . . . . . . . . . . . 106-2863 Rear Intake w/shaft. . . . . . . . . . . . . . . . . . 106-2864 Rear Exhaust w/shaft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106-2865 24. Shaft, set, rocker arm, 1936-'47 OHV BT; KN Series (Set of four, Includes spacers and hardware). . . . . . . . 106-2413 25. Nut kit, rocker arm 7831 . . . . . . . . . . . . . . . . . 106-3632 26. Adaptor, Manifold, conversion, plumber to o-ring. . . . . 106-4654 27. O-ring, manifold 27060-55 each . . . . . . . . . . . . . . 50-8046 10 pack . . . . . . . . . . . . . . . . . . . . . . . 50-8132 28. Gasket, set, head, KN-Series, Copper 3 5/8" bore (each) . . . . . . . . . . . . . . . . . . . . 106-2681 2 pack . . . . . . . . . . . . . . . . . . . . . . . . 106-2432 3 7/16" bore. . . . . . . . . . . . . . . . . . . . . . 106-2689 29. Oil line, Return 1936-'47 OHV BT (S&S Tins Only) Kit of 4. . . . . . . . . . . . . . . . . . . . . . . 106-4446 Front Intake. . . . . . . . . . . . . . . . . . . . . 106-4447 Front Exhaust. . . . . . . . . . . . . . . . . . . . 106-4448 Rear Intake. . . . . . . . . . . . . . . . . . . . . 106-4449 Rear Exhaust. . . . . . . . . . . . . . . . . . . . . 106-4450 30. Seal, Oil Return Line, FHP tins only 28" OD x .18" ID x 1", Rubber Hose. . . . . . . . . . . . 106-4456 31. O-ring. . . . . . . . . . . . . . . . . . . . . . . 900-0669 32. Oil supply fitting, Cad Plated 17325-42 . . . . . . . . . . . 106-4618 33. Oil return fittings, Parkerized 17320-38 . . . . . . . . . . . 106-4619 34. Washer, Lock, .385" x .680" x .094",Zinc . . . . . . . . . . 50-7052 35. Nut, Jam, 7/16-20, Zinc. . . . . . . . . . . . . . . . . 106-4356 36. Washer, Thrust, Stepped,.015" 17465-36 . . . . . . . . . . 106-4352 37. Washer, Thrust, Stepped, .060". . . . . . . . . . . . . 106-4883 Parts Not Shown: 38. Manifold, kit, o-ring, 17/8", VOES, KN93. . . . . . . . . . 106-4530 39. Gasket, kit, engine, KN-Series, with hardware. . . . . . . 106-2414 40. Pushrod, set, non-adjustable, KN93, steel 1936-'47 OHV BT. . . . . . . . . . . . . . . . . . . 930-0009 41 . Cover keeper, kit, pushrod, KN93 17949-40, 17950-66 . . . . . . . . . . . . . . . . . . 93-4106 42. Oil line, supply, "Y" feed, 1936-'47 OHV BT Stock 74", KN74, KN93, S&S/Stock Carb. . . . . . . . . . 106-4670 43. Bottom collar spacer–required when using S&S valve springs with stock steel "tins". . . . . . . . . . . . . . . . . 106-5094 44. Rocker arm cover gasket kit, 1936-‘47 big twin. . . . . 900-0493

1. Head, kit, .421" dual steel For covers, gloss black 1936-'47 OHV BT; KN-Series. . . . . . . . . . . . . . . . . . N/A 2. Valve Intake, 1.940". . . . . . . . . . . . . . . . . . . . . 106-3630 Exhaust, 1.750" . . . . . . . . . . . . . . . . . . . . 106-3629 3. Valve seat Intake, 1.940". . . . . . . . . . . . . . . . . . . . . 106-2821 Intake/Exhaust, 1.750". . . . . . . . . . . . . . . . . 106-2822 4. Valve guide, intake/exhaust for Stock (see valve guide diameter chart) Standard 18185-40, 18181-36 . . . . . . . . . . . . . . . . 106-3637 +.002". . . . . . . . . . . . . . . . . . . . . . . . 106-3948 +.004". . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106-3638 +.008" . . . . . . . . . . . . . . . . . . . . . . . 106-3639 Valve guide, intake/exhaust for S&S KN-Series Standard. . . . . . . . . . . . . . . . . . . . . . . 900-0526 +.002". . . . . . . . . . . . . . . . . . . . . . . . 900-0527 +.004". . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900-0528 +.008" . . . . . . . . . . . . . . . . . . . . . . . 900-0529 5. Gasket, lower valve cover (tin), 1936-’47 OHV BT. . . . . 900-0668 6. Cover, kit, bottom, valve spring, (tins), black anodized, (includes screws) 1938-'47 BT KN-Series. . . . . . . . . 900-0674 NOTE - bottom tins will not fit stock upper tins. 7. Screw, valve spring cover 3477 . . . . . . . . . . . . . . 106-3634 NOTE - Valve spring components below are not interchangable with stock and must be used together. 8. Bottom collar, valve spring. . . . . . . . . . . . . . . 900-0670 9. Shim, valve spring .015" . . . . . . . . . . . . . . . . 106-4549 10. Spring, kit, valve, dual, .421" . . . . . . . . . . . . . . 106-4362 Springs only,1936-'47 OHV BT . . . . . . . . . . . . . 900-0535 11. Top collar, valve spring. . . . . . . . . . . . . . . . . 106-3828 12. Keepers, valve spring, top collar. . . . . . . . . . . . . 90-2037-S 8 Pack. . . . . . . . . . . . . . . . . . . . . . . . . . . . 50-7165 13. Cover, kit, top, valve spring, (tins) 1938-'47 BT; KN-Series Chrome. . . . . . . . . . . . . . . . . . . . . . . 106-2400 ± Gloss Black Powder coat. . . . . . . . . . . . . . . . 106-2893 NOTE - top tins will not fit stock bottom tins. 14. Gasket, kit, valve spring cover, top, S&S only. . . . . . . . 106-3166 15. Nut, rocker shaft, with o-ring, chrome 1936-'47 OHV BT 17447-36 each. . . . . . . . . . . . . . . . . . . . . . . 106-4355 ± 16. O-ring,(-017),.676" ID x .816" OD,Black,. . . . . . . . . . 50-0466 17. Housing, rocker arm, (knuckles) ,1936-'47 OHV BT Set, Polished. . . . . . . . . . . . . . . . . . . . . 900-0617 Front, Polished. . . . . . . . . . . . . . . . . . . . 900-0618 Rear, Polished. . . . . . . . . . . . . . . . . . . . . 900-0619 Set, As Cast. . . . . . . . . . . . . . . . . . . . . 900-0622 Front, As Cast. . . . . . . . . . . . . . . . . . . . 900-0623 Rear, As Cast. . . . . . . . . . . . . . . . . . . . . 900-0624 18. Screw, HHCS, 3/8-16 x 1"– Cadmium plated. . . . . . . . 106-4597 19. Screw, HHCS, 3/8-16 x 11/2"– Cadmium plated. . . . . . . 106-4598

All reference to HD® part numbers is for identification purposes only. We in no way are implying that any of S&S Cycle’s products are original equipment parts or that they are equivalent to the corresponding HD® part number shown.

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WARNING:CancerandReproductiveHarm–www.P65Warnings.ca.gov

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