Hi, I am building a 1971 340 for my 71 Challenger (not the original engine, this came out of a 340 Duster). The heads that it had on it, which I have no idea if they were original for that block, are 360 J heads which have that cast into them; with the smaller 1.88 intake. I would assume that since the 360 didn't appear until 1971, that these heads are not the original heads. Do Chrysler heads have a way to find the year of casting? The numbers on them are 34891B
But anyway, these are the...
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But anyway, these are the...
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