1966 383 head question.

[troy.70R/T]

I was wondering what casting number would have came stock on a 1966 383. Would it be a closed chamber head or open chamber head? When looking for some good closed chamber heads what numbers should I be looking for? Thanks

[A383Wing]

last 3 digits would have been 516...they are closed chamber with 1.60" exhaust valves

The last year for closed chamber heads was '67...

[troy.70R/T]

Thanks for the help, I appreciate it. Troy