366cc   2.300 x 1.880    1.625 Dual Spring

The BRODIX BB-3 XTRA has taken the conventional big block to the next level. These cylinder heads feature a valve angle that is rolled two degrees. The -3 XTRA is available in a rectangular-shaped or oval-shaped intake port configuration. The rectangular port is offered in an out-of-the box version or completely CNC ported. The out-of-the-box version comes standard with CNC ported 119 cc combustion chambers, CNC bowls blended and ports matched, and flow over 390 cfm. The BB-3 XTRA CNC ported version has 366 cc intake ports, 199 cc chambers, and flows over 420 cfm. The BB-3 XTRA CNC ported oval ports are available in three port volumes: 332 cc, 351 cc, and 366 cc. This wide range of port volumes allows the oval port to dominate virtually any engine combination available. Port shape, port velocity, and the latest technology have propelled these cylinder heads to the top of their class.