I thought I would share my flow numbers after having my heads ported this winter. Heads are Dart Pro 1's 215cc intake runners, 2.08/1.60 valves. They were ported by Mike Start at CFM here in Indy.
Test Pressure 28", Test bore 4.030", no pipe on EX for test.
Lift....In.CFM..........EX.CFM......% of EX to IN
.100....80................68...................85
.200....148..............127..................86
.300....200..............180..................90
.400....244..............207..................85
.500....281..............220..................78
.600....303..............225..................74
.700....308..............232..................75

 

I am looking into buying a set of these, did you flowtest them before porting?

What size are the primaries on the headers you are using?

 

Good numbers. Here are my Dart Pro 1 200cc heads with some bowl cleanup. 2.05 intake and 1.60 on the exhaust. I will have to check if the exhaust had a pipe or not. The test was started at .300 lift. These will be going on my next rebuild.

Lift.........Intake.........Exhaust

.300........209............155
.400........237............193
.500........269............216
.600........281............222

 

No I don't have any flow numbers before the porting, I wish I did to compare. I think Chevy high performance did a head comparison and has them on their website. The headers I've been using are just 1 5/8 Hedman LT's. I have a set of Hooker 1 3/4 LT's that I will be putting on soon though, they should be matched better to my combination.