Quote:

Is there a difference in the std W9 and W9rp ex. flanges?
I've got my eye on a set of non rp heads,and I think I would want 3/8".FWIW



Yes there is actually quite a difference they won't inner change.

W9


W9RP


If there is enough interest in 3/8" flanges I could do a run of them but more people want 1/2". So the run of 3/8" might cost a little more.

SDG Motorsports
Hellcat Demon and Redeye Supercharger CNC Porting
https://www.sdgmotorsports.com/