273 commando heads vs. standard

ddartdude said

TMM -- I have the 6th printing of the part &casting number book dated Jan, 1996.

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I have a 1991 book. Those numbers aren't in there but my 2013 book has them in. It lists the #920 head with CAP and the #951 head for the D Dart as having a 1.87 intake valve. It is interesting though that in 67 the #920 head has the 1.78 valve. I have a pair of #920 heads I will look at later to see if I can figure out what I have. The casting number and production date should tell.

toolmanmike said

I thought I remember reading they used some slightly larger 392 Hemi valves.

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Like finding a needle in a haystack but I will look for this info as well.

Thanks for the discussion. Interesting stuff.