Vortec GM head Small Block Chevy Pocket Porting Job only
1.94 Intake & 1.5 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 | 37.6 | 37.6 | 0.0 | 73.2 |
| 0.100 | 68.1 | 70.2 | 3.1 | 76.0 |
| 0.200 | 136.1 | 139.1 | 2.2 | 76.2 |
| 0.300 | 193.1 | 193.1 | 0.0 | 72.3 |
| 0.400 | 222.8 | 227.3 | 2.0 | 67.1 |
| 0.450 | 228.8 | 234.7 | 2.6 | 69.5 |
| .0500 | 228.8 | 234.7 | 2.6 | 72.2 |
| 0.550 | 225.8 | 231.7 | 2.6 | 74.6 |
Exhaust Port Test Results
Lift
Previous CFM Current CFM
% Gain Exhaust/Intake
| 0.050 | 26.3 | 27.5 | 4.6 | 73.2 |
| 0.100 | 51.8 | 53.4 | 3.1 | 76.0 |
| 0.200 | 105.9 | 105.9 | 0.0 | 76.2 |
| 0.300 | 134.8 | 139.6 | 3.6 | 72.3 |
| 0.400 | 144.4 | 152.5 | 5.6 | 67.1 |
| 0.450 | 146.8 | 163.2 | 11.1 | 69.5 |
| 0.500 | 147.6 | 169.6 | 14.9 | 72.2 |
| 0.550 | 149.2 | 172.8 | 15.8 | 74.6 |
Work done. Pocket Port Job, flow test, Valve Job, set up springs. $529.00 4/01