My Dart Pro 1 flow numbers after porting
03-21-2006, 05:31 PM
#1
My Dart Pro 1 flow numbers after porting
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
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
03-21-2006, 08:18 PM
#2
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Car: 87 & 89 Iroc's
Engine: 5.0 - 5.7
Transmission: 700R's
Axle/Gears: 2.77 - 3.70
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?
What size are the primaries on the headers you are using?
03-21-2006, 09:48 PM
#3
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
Lift.........Intake.........Exhaust
.300........209............155
.400........237............193
.500........269............216
.600........281............222
Last edited by 1989GTATransAm; 03-21-2006 at 09:52 PM.
03-22-2006, 06:35 AM
#4
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.
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