I would imagine that the CKO engines at Tonawanda would have similar markings to this CRV and MQ markings.
I have also seen a purplish pink wide brush mark where the intake meets the block and head on the front driver's side of the block as white paint marks on the sides of the blocks but cannot find a photo of these at this moment. If I do I will post them.
In addition, I always paint my blocks with a cast iron color, install a set of shop exhaust manifolds and then shoot the Chevrolet orange like was done at the Tonawanda plant.
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