454 Questions

Discussion in 'Chevy C/K Truck Forum' started by jake62nhra, Oct 11, 2012.

  1. jake62nhra

    jake62nhra New Member

    I have a 91 R3500 with a 454 in it. I replaced the motor with a rebuilt one out of a 77 motor home. I used the original peanut port intake on the oval port heads. I also put in a Summitt # 1301 cam with a new double roller timing set. The cam was recomended by the Summit rep for fuel injection. The cam specs are .500 lift with .218-.228 duration at .050, with a 114 centerline. The salesman said this would work ok with TBI. The problem I have is low vacum signal to the map sensor. Is the peanut port intake compatible with the oval port heads.

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