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Chrysler’s 1947 Aluminum Head Design

drawings provided
by Tom Rock

Back in 1947, Chrysler engineer A.J. Rock completed work on a design study for aluminum heads, which would have been unusual for American production cars of the time. Presumably, they would have been used with a light aluminum block. Alcoa was specified as the supplier, as of 1948, at least.

1947 blueprint label

68RT noted that they were using parallel valves, so it was not a Hemi head, though that’s what Chrysler would use on their 1951 cars. These could have been part of Chrysler’s research into a lightweight, efficient car — in 1947, certain resources were still being rationed, and the V8 craze was still in the future.

The heads would have been cast. Most of the blueprint is reproduced here — smaller than on the original, because one can’t unfold a web page.

surface instructions

aluminum heads

around ports

exhaust port

heads

aluminum heads

large

wall thickness

For perspective, here is the entire sheet. Not much paper was wasted here.

full sheet

Also see engine creators: Willem WeertmanPete Hagenbuch

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