Re: replacement blocks
Have seen two 454s both with three digit assembly codes, and one is in my car. Can't speak of the first it might have been from a LS6 (that was the code ) that someone forgot to stamp with the VIN, but the second was bought as a short block LS7 or LS6 from Nickey Chevrolet.
Have magazine photos showing the Nickey decal on the rear window circa 1974, know the guy who bought the engine and dropped it into the car, he is restoring it for me at the moment. the storey of the engine is documented by 1974 magazines etc. These cars were never sold with a 454 so know it did not come with the car, but has been in the car since new,
Neither block had a VIN.
Don't know what this means except that you could buy a short block with an assembly code, in 1970 & 1974.
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