Thread: 4:00” or 4.21?
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Old 12-23-2020, 09:53 PM
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70 bird 70 bird is offline
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Join Date: Feb 2005
Location: Taylor Mi.
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I would go with the 4.21 with good rods. It will make more power at any RPM vs the 4.00. I have never bought into the smaller is better theory.

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