S&S CYCLE Cylinder Heads - Twin Cam 90-1293

The S&S CYCLE Cylinder Heads (90-1293) deliver measurable port flow improvements that unlock performance gains now while preserving headroom for future upgrades—whether you're running stock displacement or pushing into big-inch territory. These fully assembled heads eliminate guesswork with precision-engineered valve sizing and spring rates optimized for your engine's displacement and piston combination. Built to U.S. manufacturing standards, they're engineered to accept OEM intake manifolds and integrate seamlessly into your existing engine platform.

• Fully assembled, ready-to-install
• Two chamber options available
• 79cc: stock 88"–103" motors
• 89cc: 103"+ or high-compression
• 79cc valve specs: 1.940" intake / 1.575" exhaust
• 89cc valve specs: 2.000" intake / 1.605" exhaust
• Valve lift rated: .640"
• Machined for compression releases
• Includes four long headbolts
• Accepts OEM intake manifolds
• Compatible with S&S rocker boxes
• Not compatible with Twin Cooled heads
• Made in the U.S.A.
• MPN: 90-1293