- Oct 20, 2003
- 1972 Blue T top
Has anyone one seen cfm flow tests on 2 1/2 inch SBC/BBC 65 to 67 side pipes? I was at the 06 Vettes at Carlisle and saw a restoration parts display. They had a cutaway of I believe an original 65 to 67 side pipe and the inside diameter was not 2 1/2 inches when it goes through the chamber crimps. That left me with the impression that they are restrictive. I help judging what I saw.