Re: 1966 c20
Moly Orange was generally the right color on engines of that era. The 60-62 235 six was blue but that was a totally different engine from the 194, 230, 250 and 292. In 1977 all GM engines were a switching over to Corporate Blue. There was an odd looking green that was used on Chevrolet pickup truck engines around 1965-66 but it was mostly on the 283 engines.
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