These "adapters" are available after market. Two sizes that I know of, one for early (54-55) and late (56 and later?)
Special tools are available to remove them, I got mine from a TBird parts supplier
slick56 (2/17/2014)
Is there an easy way to remove the adapter from the rear of the head, so it can be used in another head?
Thanks, Al.
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54 Victoria 312; 48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ