Street/Strip Porting
This is our basic service. Completely worked ports and bowl areas, with chamber polishing and blending. Valve job included, Stage 1 conversion (if specified) and other rebuilding work not included.
$675.00
Flow results: '72 455 "148" castings, standard valve size (GS 455 heads)
|
Valve lift in inches |
Intake stock | Intake ported | Exhaust stock | Exhaust ported |
| .100 | 59 | 68 | 52 | 56 |
| .200 | 120 | 147 | 100 | 109 |
| .300 | 175 | 194 | 124 | 138 |
| .400 | 208 | 232 | 140 | 168 |
| .500 | 218 | 250 | 147 | 181 |
| Averages (.200-.500) | 180 | 206 | 128 | 149 |
Specifications: Intake valve size - 2.00" : Exhaust valve size - 1.625
Flow numbers in Cubic Feet per Minute (CFM) flowed at 28" H20
Flow Results: 430ci "Big Port" heads, with STG 1 conversion
| valve lift in inches | intake stock | intake ported | Exhaust Stock | Exhaust Ported |
| .100 | 68 | 68* | 55 | 55* |
| .200 | 140 | 145 | 105 | 114 |
| .300 | 198 | 202 | 126 | 144 |
| .400 | 233 | 252 | 142 | 181 |
| .500 | 236 | 272 | 149 | 195 |
| Averages .200-.500 | 201 | 217 | 130 | 158 |
* Lack of .100 valve lift flow increase with porting is due to the work which is performed automatically when the larger valves are installed. Increases in the .200-.500 lift ranges due to porting/chamber work.
Stage 1 Conversion and our Street/Strip port work, will get you basically competition ported "small port" heads. This is due to the fact that more material has to be removed from the later heads, thus more time is involved. If your lucky enough to have 430 big port heads-- use them!
Specifications:
Intake Valve Size: 2.130
Exhaust Valve Size 1.755
Flow numbers in CFM @ 28" H20