Rather, they were equipped with the 3956618 block, which also used large-journal main bearings, but was a completely different casting. So early Z28 Camaros of the 1969 model year did not use that block. ![]() Keep in mind that 3970010 blocks came out in early 1969 calendar year. They would have stamped in a 2-letter code which indicated a rare and valuable block, such as the "DZ" for a 302, or other codes for a high performance Corvette block. Yet your numbers do not look like the type typically stamped into a block pad by fraudsters. So if you had reported something like, "V 1004KS," I would have decoded that to mean October the fourth, of whatever year that the casting date code indicated. Then normally the next TWO numerals indicate the production day of the month. Then after that first alpha character, the first TWO numerals identify the month (in this case, " 10," I suppose). (A " V" or an " F" indicate the Flint, Michigan engine plant, while a " T" would mean Tonawanda, NY). Normally, the alphabetic character in front designates an engine plant. Normally, there would be 4 numbers between the letters, while you show only 3. The stamped Engine Assembly Code number that you reported, " V100KS" doesn't fit the usual system, as we understand it. This way they can "match" production date sequences of multiple components, eventually ending up with a more complete story on exactly which engine they are looking at. Rather, they break down all of the numbers found all over an engine, and compare/contrast them against each other. People who are really good at identifying correct original Chevy V8 engines don't really rely on any ONE number to convince them what an engine is. Some to mislead collectors others because they are trying to replace the correct original numbers after a block has been decked. Moreover, many people have been restamping engine numbers for years. Sometimes they stamp their own numbers in place, for warranty purposes. Engine rebuilders usually mill the deck surface of the blocks, removing original numbers in the process. Personally, after years of dealing with questions about Chevy V8 casting numbers and engine identification, I have developed low confidence in the stamped numbers on the engine pad, UNLESS I am absolutely certain that the numbers are original and not replaced. Yet, with so many partial and confusing bits of info showing up in this thread, I suppose I should have been more thorough before, or just stayed out of it. Sorry for incomplete information earlier, but this can be a very drawn-out process sometimes. Forged cranks had a much wider parting line, leaving evidence of it being ground down. A cast crank will have a simple seam mark there. The way to spot a forged Chevy crankshaft is to look at the parting line from the original mold that was used to manufacture the crank. The 302 crank was also forged instead of cast, as were some other small blocks. The special 302 crank had a shape on the flange-end of the crank like a pie with one piece cut out, whereas the 350 and other cranks had more complex shapes. However, a potential visual clue on the outside is to look at the flywheel flange on the crank. But you can't see that casting number with the oil pan in place. The crank casting number ended in " 1178," if I recall correctly. Thus, the same bore with a shorter stroke resulted in fewer cubic inches.along with a much faster revving engine.perfect for trans-am style racing. The engine used the same size rods, but pistons with a lower wrist pin position, so the piston would still rise up to the top of the cylinder bore, making good compression. The thing that made a typical 350 block into a 302 was a special crankshaft, with a shorter stroke. Keep in mind that 302, 327, and 350 Chevy V8 engines all used a 4" bore block. In researching the casting number book I wrote years ago, I learned a lot about Chevrolet casting numbers. It is the same block used for the ultra common 350 V8. It is one of the most common casting numbers for small block Chevy V8 engines from 1969 well into the 70's. NO, that casting number does NOT necessarily indicate that you have a 302.
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