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Original Message
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| Your drill bit numbers are good. |
| By Dave Shoe - 02/24/2004 8:52:28 AM; IP 216.243.176.34 |
The cylinders are typically thinnist at the top, as the patterns have a "draft angle" which allows the sand to slip out of the mold. The parting line of the water jacket pattern is about two inches below the deck surface, meaning the widest point is gonna be close to the deck.
It's not uncommon to find 360/390/410 blocks with 18/64 gaps in at least one place on the block. Your thicker numbers suggest you have a good water jacket. I don't know whether it's a 361/391/428 sized jacket, but it's apparently not far from those numbers.
Since the C7ME-A was used on any FE of that era, it could be cast as a 352, a 330FT, a 391FT, a 428, or others, it depends on which cores were stuffed into the mold. It's important that you ignore literature, all the crappy literature, which erroneously lists FE part numbers. The books are plain wrong, and all repeat early resources which improperly listed the numbers.
As for overheating, there are easy checks. Just do a sonic mapping of the block and look for thin areas. Overheating is most commonly a result of excessively thin cylinders which flex and allow combustion gasses to leak past the ring, thus overheating the piston skirt, expanding the aluminum and causing seizure.
Shoe. |
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