Hooker super comp. 1 7/8" small block
The collectors are 3 inch, and I have slip on reducers for a 2 1/2 inch exhaust.
They will not work with power steering, I had to change over to manual steering for these headers.
I don't race the car anymore, and installed smaller tubes and put back the power steering. The car did run alot better with the larger tubes.
Ernie