MFI Throttle Housing and Intake Stack Variations

  • 69-71 Model years
    • Throttle Bodies have linkage stops on opposite end of throttle valve shaft from linkage attachment arm
    • Intake Stacks are made of magnesium and use either metal or plastic intake air horns
    • Cold start feature is located in air cleaner
  • 72-73 Model years
    • Throttle Bodies have linkage stops on same end of throttle valve shaft as linkage attachment arm
    • Intake Stacks are plastic and have integral cold start squirters
  • T, E and S Throttle Bodies and Intake Stacks have different bore diameters to match the heads of these various engines

Info for 2.0 MFI components (1969)

  • 911E

    • Intake Stack

      • Casting part numbers: 901.110.309.0R or 901.110.317.0R
      • Diameter at top: 38mm
      • Diameter at bottom: 35mm

    • Throttle Body

      • Casting part number: 901.110.101.0R
      • Throttle plate diameter: 38mm
      • Exit bore diameter: 32mm
      • Stud spacing for induction stacks: 66mm

  • 911S

    • Intake Stack

      • Casting part numbers: 901.110.309.0R or 901.110.317.0R
      • Diameter at top: 46mm
      • Diameter at bottom: 38mm

    • Throttle Body

      • Casting part number: 901.110.101.0R
      • Throttle plate diameter: 38mm
      • Exit bore diameter: 35mm
      • Stud spacing for induction stacks: 66mm

Info for 2.2 MFI components (1970 and 1971)

  • 911E

    • Intake Stack

      • Casting part number: 911.110.301.0R
      • Diameter at top: 38mm
      • Diameter at bottom: 35mm

    • Throttle Body

      • Casting part number: 911.110.101.1R
      • Throttle plate diameter: 38mm
      • Exit bore diameter: 32mm
      • Stud spacing for induction stacks: 72mm

  • 911S

    • Intake Stack

      • Casting part number: 911.110.303.1R
      • Diameter at top: 42mm
      • Diameter at bottom: 38mm

    • Throttle Body

      • Casting part number: 911.110.101.2R
      • Throttle plate diameter: 38mm
      • Exit bore diameter: 36mm
      • Stud spacing for induction stacks: 72mm

Info for 2.4, 2.7RS and 3.0RS MFI components (1972 thru 1974)

  • 911T

    • Intake Stack

      • Casting part number: 911.110.316.1R
      • Diameter at top: 36mm
      • Diameter at bottom: 32mm

    • Throttle Body

      • Casting part number: none
      • Throttle plate diameter: 38mm
      • Exit bore diameter: 30mm
      • Stud spacing for induction stacks: 72mm

  • 911E

    • Intake Stack

      • Casting part number: 911.110.314.1R
      • Diameter at top: 38mm
      • Diameter at bottom: 32mm

    • Throttle Body

      • Casting part number: none
      • Throttle plate diameter: 38mm
      • Exit bore diameter: 32mm
      • Stud spacing for induction stacks: 72mm

  • 2.4 911S, 2.7RS & 3.0RS

    • Intake Stack

      • Casting part number: 911.110.312.1R
      • Diameter at top: 42mm
      • Diameter at bottom: 38mm

    • Throttle Body

      • Casting part number: none
      • Throttle plate diameter: 38mm
      • Exit bore diameter: 36mm
      • Stud spacing for induction stacks: 72mm