I had my factory LT-1 heads ported and installed Manley valves (2.00 Intake/ 1.57 exhaust) and these are the preliminary flow numbers. How do these numbers look compared to what others are getting out of factory heads? The car is Supercharged with 6lbs of boost and will have a cam custom ground to match the heads. We are going to try and work the short side radius a little more on the intake side:

Intake CFM (max lift is .525)

.100- 65.9
.200- 128.2
.300- 185.7
.400- 228.9
.500- 251.3 (max flow is at .525 lift)
.600- 239.2

Exhaust CFM
.100- 55
.200- 108.9
.300- 155
.400- 180
.500- 186
.600- 190.4

Thanks in advance for the feedback!

 

Those arent too bad at all, The intake appears to have some turbulance to it, or they just flat stalled out somewhere between .500 and .600 lift. If you had flowed the exh with a pipe the numbers would have been alot better there. but they are much better than stock on both sides.

 

That's what Chapman racing also said. The heads were flowed ar 28 in of water and no pipe was used for the test.