Well, I’m cleaning and revisiting my 428 before painting and reinstallation. There is a 12 stamped by the oil filter adapter along with a 12 written on the block under the paint on the right side by the freeze plug. Is there a reason? Seems pretty coincidental. I traced it to see it better.
The exhaust manifold gaskets mean the motor has been rebuilt at least once so the 12 is something that was done by a rebuilder long after the car was new.
Those gaskets are mine that I was going to use until I learned that it supposed to be silicone sealer.
The gaskets were not installed by Ford. They use Lithium grease and it seems to work well.
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Silicone sealer had just been invented, but was not widely used yet back when our cars were built.
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