One question that is on the minds of many
Y-Block owners is "Do I have posted heads?"
Posted and non-posted refers to the support
cast in the water passage above the combustion area on '57 and
later heads, this was added to keep the quench area from lifting
under extreme pressure.It's
not a necessity in mild street engines but if you are racing or
run a supercharger it's not a bad thing to have.
All the early heads cast in the Dearborn
foundry are non-posted, if you have a set of ECZ-G heads with the
small letters there is no need to look since they are NOT going to
have the post.If you
have the large letter ECZ-G heads cast at the Cleveland foundry
there is a question whether or not they are posted.These next two photos by Ted Eaton show where to look, you
can stick you finger in the large hole and actually feel the post.
by Ted Eaton
All heads cast after 1957 (113s, 471s, EDB-Ds,
B9AEs, B9TEs, C0AEs, C1TEs, C1AEs ect.) are all posted but if you
have your doubts you can check the others in this same fashion.