Last pic is with W2's.
My machinist has a 48* R3 block and W9's. I could use everything from my 360 block on the R3.
The W2's are machined for 2.100" inlet. Square ported. flow [email protected]" and 234cfm on the exhaust.
Or they could be 319cfm@600. I'm starting another thread with pics and flow numbers.