Rajo Motor and Manufacturing

The company's Los Angeles salesman Rajo Jack helped popularize the heads.

In 1911 Joe Jagersberger retired from driving after he had one of his legs amputated.

[1] Rajo Motor started out building spark plugs and other various engine parts.

The BB featured a higher compression ratio and the BB-R also included two spark plugs per cylinder.

[1] Chevrolet work He also offered a modification to the 1941-52 Chevrolet "Stovebolt" L6 OHV 15 bolt head, which added another set of 3 intake ports above the 3 originals, to permit adding (an) extra carburetor(s) on a separate manifold.