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that's pretty decent size motor probably around a 3.8 or a 4.0 but its a 421 not the 4.0 because it doesnt fall into an exact liter size

*sorry, that's not correct. The 421 is listed by Pontiac as 6.9 liters on some of the callouts(very rare). It's approximately 6.89 liters.

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13y ago

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