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Blue is the correct color. Corvette engines were painted GM Blue (this is not the same as Ford blue) starting in 77. I painted my 79 Chevy orange because I think all small Chevy engines should be Chevy orange. Yes, you can just use high heat paint from a can, just be sure to clean and degrease the engine fully before painting.
He's correct....the blue started in late 77 and continued through the early 80's.
Between August 23 and September 7, 1976, the Flint, Michigan Engine Assembly Plant changed the paint colors used on Corvette engines from orange to blue. Some early production 1977 Corvettes were still built with the orange painted engines.