Quote:
Originally Posted by War eagle
The difference of course is the lack of a pad under the early 9770716.
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Must be obvious by eyeball, I can't see any difference in the pix. Will have to look at my own pair, one about J303, the other about E154 IIRC. But won't get a chance to do that for awhile.
Quote:
Originally Posted by War eagle
I doubt if the foundry guys would agree with you regarding the end cast marks. They DIDN`T do it if "they don`t mean much". Kinda sad John
Hoping other 64 guys with the 716 and those end marks could give us some dates and their + or minus. I am betting on nite or day shift. I would have thought the foundry pattern number would be part of the casting but I don`t see anything else.
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Sheesh. I'm SURE it was important to foundry production. But it isn't important to a hobbyist to know if the heads were cast day or night shift. When they were cast would not mean when they were machined or when they were assembled. It would not help understand when the engine was assembled. And it would not impact when the car was assembled.
My comment was intended to mean that I doubted these marks mean much to us today.
I doubt they will tell us anything that can be associated with the application for the heads, or a particular engine, or a specific car build.
I ALWAYS find it interesting to learn about details such as the + and - marks you've posted about. But they aren't always of any real use.
And because I think they are probably of some generic meaning (such as you've suggested being day or night shift), I suggested looking at the standard '64 heads to see if the same marks are found on them. No reason to limit the research to the 9770716 heads.
I'm not able to look at my own 9770716 heads now, but do I recall perhaps a clock indicator near the cast date tag under the valve cover? Any other cast identifiers there?
Later model heads got a variety of cast identifiers external to the valve covers, including the cast date and a D-N shift indicator. Wouldn't surprise me that the '64 heads included similar cast identifiers in a different manner.
What would be an example of a foundry pattern number? Is that typically found on other Pontiac iron castings?
You mentioned Foundry number 1. I thought Pontiac cast all their heads at their own foundry at the Pontiac complex. What would Foundry number 1 represent?