Offenhauser Single Plane Downdraft

The Offenhauser single plane intake manifold is customized by LC Engineering, with a large open plenum and runners that outflow the stock Toyota manifold by a wide margin. The single plane design makes strong mid range and upper rpm power without giving up low end torque. The casting carries a Weber flange, so a Weber carburetor bolts straight on with no adapter, and it keeps every vacuum and sensor port the stock manifold has.

One install tip from the shop: put a little silicone on the end of each bolt when fitting the bottom water plate. The tolerances are tight, and those holes can weep coolant without it.

  • Single plane install kit: the 8 bolt water block plate kit, intake plug kit, thermostat housing adapter kit and gasket, intake manifold gasket, and the center of head and passenger side timing cover water block plates, all in one box.
  • Offenhauser to Weber carb spacer: a 1/2" spacer for a Weber 32/36 or 38, so the linkage hooks up properly. Hardware and two gaskets included.
  • Offenhauser water plate gaskets in 8 bolt and 11 bolt, the same gaskets used in our water plate kits.

Sidedraft Kit for Twin Webers or Mikunis

The LC Engineering 22R Sidedraft Intake Manifold Kit pairs a Cannon manifold with linkage, hardware, gaskets and O-rings for 40mm or 45mm Weber DCOE or Mikuni sidedraft carburetors, for 1981 to 1995 22R engines. It needs an electric fuel pump, and an 83 to 95 style thermostat housing needs one of our thermostat housing adapters.

Planning nitrous on a sidedraft build? LC Engineering will drill and tap the sidedraft manifold for nitrous as a machine shop service. The manifold is not included in that labor charge.

Intake Manifold Plug Kits

The 22R carbureted plug kit has every plug for a stock or Offenhauser manifold plus spare 3/8" JSPT straight plugs. Two of the holes need the shouldered plug, and a straight plug there will not seal. The 22RE EFI plug kit is for a stock 22RE manifold on stand alone engine management or propane, and is not recommended for trucks keeping the stock ECU.

Pick the carburetor to suit the manifold under 22R carburetors. Running fuel injection? See 22R and 22RE fuel injection. Everything else for the truck is in the 1989 to 1995 Pickup catalog, and our tech team can help match a manifold, carb and cam.

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