Greetings . . .
I am not sure why they call it blue gay. Looks pretty gray to me:
But I guess there was some variation year to year and from factory to factory which I think is what has lead to shades-of-gray controversies on various boards.
Notice the black fan. Everything I have read suggests that these engines were painted before any accessories were bolted up.
chevsoftheforties has got what they claim to have color matched with NOS parts
ChevsOfTheForties Gray .
The 216 in my '49 was at some point treated to a rattle-can rebuild:
including the fan (although most has peeled off).
regards,
stock49