Horse power, torque, mpg 9.80K 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? 0 Answers ActiveVotedNewestOldest Register or Login Offenhauser Sales Corp, 5300 Alhambra Avenue, Los Angeles, CA 90032 Phone: (323) 225-1307