Merlin 310 World Products #030030 310 Rect. Port Cast Iron
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 | 40.4 | 48.2 | 19.3 | 71.3 |
| 0.100 | 71.8 | 89.7 | 25.0 | 78.1 |
| 0.200 | 151.5 | 172.3 | 13.7 | 68.9 |
| 0.300 | 228.8 | 258.5 | 13.0 | 68.9 |
| 0.400 | 273.3 | 285.2 | 13.0 | 65.6 |
| 0.500 | 308.2 | 326.1 | 5.8 | 67.7 |
| 0.600 | 321.6 | 352.9 | 9.7 | 68.0 |
| 0.650 | 321.6 | 361.8 | 12.5 | 69.9 |
| 0.700 | 326.1 | 368.5 | 13.0 | 69.5 |
| 0.750 | 328.3 | 373.0 | 13.6 | 70.3 |
Exhaust Port Test Results
Lift
Previous CFM Current CFM
% Gain Exhaust/Intake
| 0.050 | 35.2 | 34.4 | -2.3 | 71.3 |
| 0.100 | 70.1 | 70.1 | 0.0 | 78.1 |
| 0.200 | 120.4 | 118.8 | -1.3 | 68.9 |
| 0.300 | 152.5 | 169.6 | 11.2 | 65.6 |
| 0.400 | 182.4 | 193.6 | 6.1 | 67.9 |
| 0.500 | 195.2 | 220.8 | 13.1 | 67.7 |
| 0.600 | 201.6 | 240.0 | 19.0 | 68.0 |
| 0.650 | 203.2 | 252.8 | 24.2 | 69.9 |
| 0.700 | 206.4 | 256.0 | 24.0 | 69.5 |
| 0.750 | 206.4 | 262.4 | 37.1 | 70.3 |