This is probably an easy question, but..., Anyway over the years I've heard of both large and small "G" heads. Having only seen one set of these heads in person the question is, is it a difference in the size of the cast in letter and how do you tell them apart? Thanks for educating me on this point.

I did try a search first, but the search function doesn't seem to like me. Thank you all again. -Dave.

Well I was wrong and not for the first time. Thought the heads I have were little G, but they are the large G. The only other numbers I found were D22 on one head and D23 on the other. These numbers were bellow the center two exhaust ports. This would be the date codes right? If so, they are still unposted correct? At least the pads still measure at 1", so maybe they are still savable.

Thanks again. This is a great place. -Dave.

Tim McMaster has a helpful Internet posting on his web site that addresses the cylinder head 'posting' issue.  Click the Internet address below to view it.  While Tim has put this on the Internet, my understanding is that the pictures are from Ted Eaton.

http://yblockguy.com/techtips/postedheads.html

When you look at the picture of the cylinder head, it indicates with dashed circles where the 'posts' are located.  Using a flash light, look in the holes the white arrows point to and angle the light toward where the 'posts' are indicated to be.  IF the posts are there, you can't miss them.

Even IF the heads are not posted, unless they're really badly pitted, .025 will probably clean them up satisfactorily for use.  Your auto machine shop will be able to advise you on this.  With the composite-type cylinder head gaskets, I can't imagine your having a sealing problem.  The pitting in the cast iron (caused probably by out-of-doors condensation moisture eroding the metal) can be a source of  pre-ignition IF the pitting is severe...

In working on this 'old stuff', your machine shop may be glad to hear how thick the pads were when Ford produced the heads.
 
Hope this helps.   


NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York