Ok, you have noticed the dimple in the top of this head bolt. 14 of the 15 head bolts on my new T are like this. Anyone know when these were used. Car is a 1924, made Dec 7th 1923.
You're assuming that they're OEM bolts. Not saying they aren't... just sayin'.
The change records is in the encyclopedia - lots of changes, as on most other parts:
This may have to do with your observation:
"6-25-24 Removed pocket from head."
Many years ago I believe a Morgan race car was over weight and they had removed all the excess weight there was nothing left to remove and they were only about a pound over so the engineer came up with a brilliant idea by drilling the head on each bolt until the weight was met. The car won the race and thereafter all Morgan bolts have the heads drilled. Maby Ford had a shipping weight issue?
Why didn't they just let one pound of air out of each tire ??
I found some bolts that look like head bolts that are dome shaped. Could they be head bolts?
26/27 head bolts were dome shaped and nickel plated.
If you find out, post it. I have seen them a lot, but am unaware of the correct year.
"Domed head" bolts were also used for the manifold bolts (not studs), valve cover bolts (again, not studs), water inlet & outlet bolts, trans. cover to block and generator bracket to block on later "Improved" models.
I'll try and assemble the above mentioned bolts later for a photo op.