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Sbc swap to bbc

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01-10-2020, 08:16 PM	#1
Sawlog Registered User Join Date: Jun 2017 Location: Central illinois Posts: 143	Sbc swap to bbc Have any of you swapped your sbc to a big block? If so... how bad did it hit the mileage? I'm getting 13 miles a gallon with my mild 350. Th 400 tranny with 3.42 gear. Was wondering what a big block would do. Thanks

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