All 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.
