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  1. 4spd67

    Port Match or Not

    Received new Promaxx 171/65cc heads a few days ago. Promaxx recommended Fel Pro 1213 intake gasket. Measured intake ports on heads a few minutes ago at 1.125" x 2.250". Looking at using a Edlebrock RPM AirGap intake (port: 0.98" x 2.16") on website. Fel Pro 1213 port size is (1.160" x 2.270")...
  3. 4spd67

    Head gasket for aluminum heads

    Just received a new set of aluminum heads for my 340 build, Promaxx 171/65cc heads. Never ran aluminum heads. Anyone have any recommendations for head gasket materials to use or ones to avoid? Appreciate any thoughts. Thanks
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