4-71 Blower Manifold
The blower manifold is designed for the 4-71 GMC blower. However, with a collar spacer, other types of superchargers can be used. It provides for dual pop-off valves in the basic casting that blow off at 15 psi pressure. These protect the blower and manifold in the event of a backfire.

Triple Manifold
The triple manifold is a dual system design (180 degree event separation) and provides a layout that produces even fuel distribution to all of the cylinders. The runners enter the block at an angle that make the ends of the manifold runners an extension of the port. The design is very streetable although it is geared for the performance minded and does not provide for a heat riser. It is possible to block off the center carburetor pad and run two carburetors for the street, or preferably use progressive linkage that opens the center carburetor first.

2 x 2 Universal
The 2-carburetor Universal is a dual-system design (180° event separation) and provides a layout that produces even fuel distribution to all the cylinders. This manifold has a heat crossover which helps heat the fuel for better combustion.

2 x 2 Racing Model
The 2-carburetor racing model manifold was one of Barney Navarro's first designs.It also uses a dual-system design and provides even fuel distribution to all the cylinders. All of Barney's manifolds are based on this design (180° event separation). He was the first to design runners that enter the block at an angle to make the manifold an extension of the block.

Duo-Duplex (4-Barrel)

This 4-barrel manifold is the best on the market. It is set up to allow the linkage to cross over to the passenger side. It also has a heat cross over the passes under runners. These manifolds can be used for any year Flathead. All of the Navarro manifolds are made from state-of-the-art permanent molds, and forged in a fourth-generation foundry the Barney has always used.