Big Block Cylinder Heads "915 vs 906"

1962 and early-1963 {Casting #2402286}

1962 = Plymouth 'Super Stock 413' / Dodge 'Ramcharger 413'
1963 = Plymouth 'Super Stock 426' / Dodge 'Ramcharger 426'

Intake........ 2.08"
Exhaust...... 1.88"

At one time {early days} thought to be the 'Cats Meow'.

Monster Size Exhaust Valves and Exhaust Ports.