*** IN STOCK SHIPS TODAY *** BBC 9.80" deck blower manifold. This manifold will accept a 6-71 thru 16-71 roots blower and includes manifold, gaskets, and a blower stud kit. The finish is polished aluminum and ports are rectangle. Manifold includes a spring loaded backfire valve assm. to protect the supercharger and engine in case of a supercharger sneeze.
This manifold fits all 9.80" deck blocks 396, 402, 427, 454 and most other aftermarket Chevy blocks. The floor has been radiused for better fuel distribution and the manifold is machined for a thermostat provision to make using on the street no problem.
Ports measure 2.50" x 1.750" and plenum opening is 12.50" x 4.00" but has room to be opened up if need for larger supercharger applications.