1967 Engine Stamp
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There were two separate engine machining/***'y plants in Flint. One for L4 & L6 engines (Flint Motor Plant) & the other for 8 cylinder engines (Flint V8 Engine). For years, products from both facilities used the "F" suffix. In 1967 model year, "V" was adopted to identify & differentiate Flint V8 engines from their inline cousins -- mainly for bean-counters & warranty personnel who had to assign failed engine responsibilities.
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You can use the search box and read forever, here is a sample
https://www.corvetteforum.com/forums...-for-sale.html
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Others can explain it better then me but they are marks left from decking a block. Original broach marks are very fine to heavy lines on the stamp pad running parallel to the crankshaft. Broach marks from a modern machining leaves circular lines. Do a search on broach marks to see examples.
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