[War eagle]

Phoenix is usually warmer than this but it did warm up a couple nites ago at a friends shop. 4 sets of 716 heads appeared and I took the opportunity to get some pics and observe differences.
There is no left or right head as one casting can be used for either side. However it must have been interesting to see the amount of 716 foundry patterns used during a pour.

The earliest, L32, is cast upside down,(compared to part number) and has X and O stamped at the button pads at the center exhaust ports. To the very end and right of the cast part number, is a small pad that has a line as shown with my pen in the picture.

The next pair J193, is cast upside down and has X and X with the end button pads having a line on one head and + on the other. I suppose one could say plus or minus.

E84 pair has the date upright and has X and O at center exhaust port. The end button pads are + and +.

E224 and E254 are different at the exhaust port. Dates cast upright. A fair amount of rust on 22 but looks like O and X. E254 has nothing in the first exhaust pad but looks like the O above two X`s on the second pad. Again there is a bit of rust but visable under a glass. The end button on 25 has the + and the 22 has the minus.

Not sure if this helps or what the end buttons tell us. Maybe day or nite but these are not stamped but cast in. Foundry number 1 is on all of the heads so it is likely only one line cast heads.

I was promised access to 5 different 1964 trips manifolds so that will be next week.