S&S Cycle 90-1497 S&S® Super Stock® 3-5/8" Bore O-Ring Style Single Plug Cylinder Head Kit For 1966-'78 HD® Big Twins - Natural Aluminum Finish soothie A B C D E

A B C D E F X 11" 12

Magnum Shielding 0650-1650

The outer ring LEDs function as a running light

Finish: Chrome Plated

S&S Cycle 90-1497 S&S® Super Stock® 3-5/8" Bore O-Ring Style Single Plug Cylinder Head Kit For 1966-'78 HD® Big Twins - Natural Aluminum Finish soothie A B C D ES&S Cycle 90 1497 S&S Super Stock o ring style cylinder heads for 1966 '78 HD big twins feature a stock like appearance, but flow much better than stock heads. Heads come assembled with premium valves and S&S valve springs that can handle cams with lifts up to . 590". These heads are machined for one spark plug per head and accept 3 5 8" bore cylinders, and are original equipment on S&S SH Series engines, and are a great upgrade for stock shovelheads.