JJ USE,
On the 1967 Dodge Dart GTS 383 and 1967 Plymouth Barracuda 383 'Formula S'.
The Valves were {2.08" Intake} and {1.60" Exhaust}.
The 1967 383 came thru with the #2406516 Cylinder Heads, 'Closed Chamber Design'
with 1.60" Exhaust Valves.
I've had several sets of Cylinder Heads off of the 1967 383's, and they all cam thru
with 2.08" Intake and 1.60" Exhaust with the Single-Coil Valve Springs.
Again, the 1967 Cylinder Heads did have a Closed-Chamber design.
