Chevy SBC 350 Vortec 180cc 64cc Straight Cast Iron Bare Cylinder Head 12-point head design and a

12-point head design and a larger-than-stock shank diameter

leading to valve seat damage and early valve grind

improve starting

carbon-to-coil rotor conductor

The runner length and the tapered cross-section were designed to perform well for a wide range of engine configurations

Chevy SBC 350 Vortec 180cc 64cc Straight Cast Iron Bare Cylinder Head 12-point head design and aAll Speedmaster 23deg. Small Block Chevy heads are available with Straight or Angled sparkplugs. Standard valve sizes are 2. 020 in. Intake, and 1. 600 in. Exhaust, both +. 100 in. length. While the 2. 02" valves are standard issue, all of our 23deg. aluminum heads can accept a 2. 050 in. intake valve with minimal additional work.