Not Ranked
If the paint daubs were on the back of the block then yes the 427 blocks were color coded for racing, street, marine and industrial applications. i don't see a listing for a blue and orange daub. But i do see a blue and yellow as a marine block. Also just a blue daub also for a topoiler and sideoiler but both street applications. Service blocks normally came with a blue and white paint daubs. Some block markings denote different machine steps that have been completed if in the lifter valley, side of the block etc.... Where were the paint daubs and what shape were they? Were they on the rear of the blocks? Most are circles and some use a letter beside them. The Genesis and Pond blocks are pretty much an exact copy of the originals. They even have a C5AE-H sideoiler casting number.
G.
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