Give some consideration into stepping up to a 2.250 intake valve when you send them out. I ported the set I am putting on a 505 and they are flowing great but I want to see how close to 400 cfm I can get them to. The 440-1 heads get a weight break as the B1 heads do not so I’m curious how far I can get them.

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time