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Is the engine, in fact, a 427R? Or is it a 427SR?
They both say 427R on the valve covers but the SR has a dual plane intake with a Street Avenger vacuum secondary carb. The "R" has a higher rise single plane intake and DP carb. The "SR" is much more street friendly and has the same torque figure as the "R" version but the power comes on lower in the rpm range.
I chose the SR version for just that reason. You will not be disappointed.
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Jim
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