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 journal Fits: 1966-'84 HD® Big Twins

Fits: 1966-'84 HD® Big Twins

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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 journal Fits: 1966-'84 HD® Big TwinsS&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.