Dart Pro I 325 #19200010 116cc chambers Big
Block Chevy
2.25 Intake & 1.9 Exhaust
Lift=Valve lift while testing Previous CFM=original flow
CurrentCFM=flow after porting % Gain=flow improvement in
percent
Exhaust/Intake=Relationship between intake & exhaust flow
Flowed @ 28 in.
Intake Port Test Results
Lift
Previous CFM Current CFM
% Gain Exhaust/Intake
| 0.050 | 42.5 | 48.9 | 15.0 | 87.9 |
| 0.100 | 82.3 | 85.2 | 3.6 | 89.7 |
| 0.200 | 145.1 | 160.4 | 10.6 | 73.0 |
| 0.300 | 219.9 | 222.8 | 1.4 | 72.0 |
| 0.400 | 276.3 | 273.3 | -1.1 | 75.7 |
| 0.500 | 317.1 | 312.7 | -1.4 | 75.7 |
| 0.600 | 348.4 | 352.9 | 1.3 | 73.4 |
| 0.650 | 350.6 | 361.8 | 3.2 | 73.4 |
| 0.700 | 352.9 | 370.7 | 5.1 | 73.4 |
| 0.750 | 357.3 | 375.2 | 5.0 | 73.3 |
Exhaust Port Test Results
Lift
Previous CFM Current CFM
% Gain Exhaust/Intake
| 0.050 | 51.0 | 43.0 | -15.6 | 87.9 |
| 0.100 | 72.5 | 76.5 | 5.5 | 89.7 |
| 0.200 | 107.5 | 117.2 | 9.0 | 73.0 |
| 0.300 | 143.6 | 160.5 | 11.7 | 72.0 |
| 0.400 | 188.8 | 208.0 | 10.2 | 76.1 |
| 0.500 | 214.4 | 236.8 | 10.4 | 75.7 |
| 0.600 | 233.6 | 259.2 | 11.0 | 73.4 |
| 0.650 | 241.6 | 265.6 | 9.9 | 73.4 |
| 0.700 | 249.6 | 272.0 | 9.0 | 73.4 |
| 0.750 | 256.0 | 275.2 | 7.5 | 73.3 |
Labor done. Porting, flow test, valve job, set up springs. $805.00 4/01