Horse power, torque, mpg 7.66K viewsJanuary 7, 2017 0 sambrown January 7, 2017 0 Comments i have a 82 ford 300 i6 that I’m looking to upgrade with your 4 barrel intake manifold. What kind of changes will I see in hp, torque, and mpg? Also, what size carburetor do you recommend for the best results? 1 Answer ActiveVotedNewestOldest 0 DMarv Posted January 11, 2017 0 Comments Will you be using a Dual Port or a “C” Series intake manifold. Also, will you be doing any other changes to the engine? Register or Login Offenhauser Sales Corp, 5300 Alhambra Avenue, Los Angeles, CA 90032 Phone: (323) 225-1307