This manifold fits cathedral port style heads only. This manifold is recommended for use with an LS3 style MAP sensor. Manifold and fuel rails are designed for use with Bosch EV1 or Magneti Marelli Pico fuel injectors. Fuel rails are machined for -8 AN O-ring female fittings. The LS1 and LS3 Mid-Rise intake manifolds are custom installations and will not accept all OE components.