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BN-309AL/BN-309AS/BN-309BL/BN-309BS/BN-309U

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Part Number Distance Additional Info
BN-309AL 19" between front flanges (351 engine)  van
BN-309AS 17 3/4" between front flanges (302 engine)  van
BN-309BL 19" between front flanges (351 engine)  truck
BN-309BS 17 3/4" between front flanges (302 engine)  truck
302 eng. - 17 3/4" distance
351 eng. - 19" distance

"A" IS FOR VANS

"B" IS FOR TRUCKS
Measurements Required
single or dual inlet;  length of front right neck;  number of sensors;  location of sensors;  dual or single in to converter;  3 bolt or pipe outlet