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.

Again thank you, both Noshortcuts and Ted. Guess I'll have to clean some sludge to find the date code, but will also check out what I can see/feel through the holes in the deck.

After looking at these heads last night they aren't quite as bad as I remembered. But, one head has what looks to be evidence of a swallowed bolt. Right on the edge of the combustion chamber and the quench area there is what looks like threads rolled into the cast iron. Not sure how well this will clean up, even with a full cut. Guess I'll find out. Everybody have a great Y-Block day. -Dave.