Engine Block color

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The engine block on my 1929 133 looks greenish-gray. I want to buy paint from Bill Hirsch but they do not know about PA engine colors.
Does anyone know what color gray I should ask for? I think one needs to specify make and year.

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The sales handout for early 1930 shows:
* Head – Black
* Block – Medium Blue-Gray
* Pan – Terne Coat (lead coated, which is a medium gray)
* Transmission – Light Yellow
* Carb – Brass plated, or anodised.

Although Black was most common, I believe dark red, dark blue, and dark green were sometimes seen, but I suppose these were custom orders. In any case the Head was almost always Black.

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