Alloy Sportster

• 80 cubic inches, 3.625” bore, 3.8125” stroke

• 1978 to 1983

• Duel carb aluminum heads & aluminum cylinders

• First complete aftermarket V-twin engine

• First street engine to exceed 100 horsepower

EVO

• 104 cubic inches, 3.780” bore, 4.625” stroke
• 1984 to 1998
• First complete aftermarket engine V-twin offered
• Biggest production engine made for many years
• Many features were incorporated in the H-D TC88
• First street engine to exceed 120 horsepower

Spectre

• 100 cubic inches
• 3.780” bore, 4.500” stroke
• 3.875” bore, 4.250” stroke
• 4.000” bore, 4.000” stroke
• 1991 to 1998
• First 60 degree high cam aftermarket engine
• First production dual carb Big Twin
• First street engine to exceed 140 horsepower