The heads have the numbers in a circle arrangement with 4 different numbers in the circle arrangement.

Can someone tell me how that breaks down?I know that I have seen that information somewhere.

The block is an ECZ 6015 "A" block .The only numbers that I can find on it are 5A.

Normally that would mean Jan of 1955 but its a 312 engine (At least it says ECZ on the main caps)

Usually its the first number as the year-the second location is a letter which would be the month and the third and fourth are the day.

Thanks for the advice,Oldmics