Reply to "351C cylinder heads, open chamber vs closed chamber"

George PAdmin.

Yes, the Cobra Jet motors (late '71 through '74) were specified with 4 bolt mains. From time to time one will show up with only 2 bolt mains. I have seen a 2V motor with 4 bolt mains too! The '72 through '74 blocks all had the same casting number, D2AE-CA, whether they were 2 or 4 bolt. Somehow at the factory the wrong blocks were sent down the wrong assembly line, or blocks were borrowed from one assembly line to make up for shortages in the other.

In general, if the motor was equipped with the spread bore Autolite 4300D 4 barrel carburetor, it "should" have 4 bolt mains, but the only way to be sure is to drop the oil pan, because there were exceptions.

Your friend on the DTBB, George

1/21/0610:47 AM

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