![](http://www.newagtalk.com/mapdots/jonhagen.jpg) Hagen Brothers farms,Goodrich ND | Claymore - 3/28/2011 17:29
I think Chevy and GMC swiched to blue engines around '75. I always liked the orange ones from the 60's and early 70's.
I would say the color switch was 78 or very close.
In 77, Olds was selling more cars than they could build olds engines for. They equipped certain model olds cars with chevy engines and promptly got sued by PO'd owners that wanted an olds engin in their olds car.
Next year all engines were painted that same blue color and the window sticker on your new 78 GM car stated it had a GM engine built by various divisions of GM.
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