The casting number 10049875 appears on cylinder heads manufactured by Brodix for big block Chevrolet V8 engines. Specifically, the number signifies it's the Pontiac Super Duty small port head with 91cc combustion chambers, 5.471-inch intake ports and 5.450-inch exhaust ports.
Brodix Incorporated began as a partnership between Francis Dix and his son-in-law J.V Brotherton. They produced an aluminium Hemi cylinder head in 1971, and developed their first small block Chevrolet head in 1973. Since then, Brodix has produced a range of aluminium engine blocks, manifolds and cylinder heads for Chevrolet, Mopar and Ford engines. Brodix products are popular within the automotive racing community and renowned for out-of-the-box performance.