We are about 400 cfm with the emphasis on BIG. We believe that cross sectional area is what a turbo engine is going to want. Especially for these two 88MM Turbonetics!! The exhausts are around 260. We didnt spend huge bucks like racers do porting the heads. These are just CNC for about $2500 and similar to the street heads done. Tony charges three times that for a good set of race heads, ie Super Stock, and over $12k for our Pro Stock style heads.(Similar to Langer's)
We moved the intake valve over 0.050, but then it put us back to the same spot as stock by using the 2.300 intake valve. The bore 4.35 gives us about 0.100 clearance between the intake valve and the cylinder wall. However, we dont have intake port choke to deal with on the size of these ports. We would need Tom V to tell us the virtues of CSA of the intake port to see if it impacts a Turbo motor like this as much as a NA engine.
Tom Vaught has been so very instrumental in helping us with this Turbo project. We cannot thank him enough for putting us together with Turbonetics and helping us along of the way.
Here is an article Casey read that he thought might be similar"
http://www.chevyhiperformance.com/te...k/viewall.html