Valve installation flow numbers
TA Performance Stage 1 Alum head, TSP valve installation, comparison with full competition ported 430 iron heads casting # 985
Test Specifications/
Bench: SuperFlow SF-600 Flow Bench
Bore Size: 4.350
Test Pressure: 28" H20
|
Valve lift in inches |
TA Alum head intake |
430 Head Intake |
TA Alum head
Exhaust |
430 Head Exhaust |
| .100 | 74 | 71 | 64 | 57 |
| .200 | 153 | 142 | 118 | 109 |
| .300 | 212 | 202 | 152 | 155 |
| .400 | 263 | 250 | 192 | 11717676 |
| .500 | 300 | 287 | 214 | 199 |
| .600 | 314 | 300 | 222 | 204 |
| Average flow | 200-.500 lift | |
| TA Alum head | Full comp 430 Head | |
| Intake | 232 cfm | 220 cfm |
| Exhaust | 169 cfm | 159 cfm |
These represent the minimum numbers, attained from Tri-Shield Performance installation of the TA performance Stainless Steel Stage 1 valves, vs. completed 430 Race heads, which supported a nearly 700 HP 494 race motor. It is important to note that when we install the valves, the press in valve seats are hand blended into the casting, and the bowls are blended. We do not just cut a seat, and stick the valve in.
Additionally, these heads respond well to a little combustion chamber work, as it increases the all important .200-.400 valve lift numbers, as this is where a street motor's cam "lives".
Final results, with combustion chamber work
|
Valve lift in inches |
TA Alum head intake, valve installation only |
with combustion chamber work |
TA Alum head Exhaust, valve installation only |
with combustion chamber work |
| .100 | 74 | 75 | 64 | 64 |
| .200 | 153 | 160 | 118 | 128 |
| .300 | 212 | 224 | 152 | 178 |
| .400 | 263 | 280 | 192 | 205 |
| .500 | 300 | 316 | 214 | 225 |
| .600 | 314 | 316 | 222 | 236 |
| Average flow with chamber work | 200-.500 lift | |
| TA Alum head | Full comp 430 Head | |
| Intake | 245 cfm | 220 cfm |
| Exhaust | 181 cfm | 159 cfm |
"Racing Flowbench?"
You be the judge.. a previous set of ported iron heads, that flowed 270 cfm, are on the Level 2 motor in the dyno results section. These heads are flowed on that same bench, by the same operator. The 530 HP, with 563 TQ that Level 2 iron motor made, considering it's street compression and cam selection, with a dual plane manifold, speaks volumes about how accurate these numbers really are. Considering the cam in that motor, it is using every bit of that head flow to make those power numbers. Especially the low valve lift flow, which is really the most important aspect when maximizing engine combinations for performance. You will "leave power on the table" if your .200-.400 valve lift flow numbers are not what they could be. The camshaft spends far more time in those ranges, than it does at .500 and above, in the average street motor.
Update... 5-25-03- Once again, our flow numbers and the dyno numbers for the motor are right on the money. This motor, with Headers, and a Single Plane Intake, made 575 ft/lbs of torque, and 565 HP. With a 230* @.50 camshaft! Idle speed 700 rpm, mild lope, 15" manifold vacuum!
This motor also made 522 HP with Stock cast Iron exhaust manifolds!
Exhaust side Head flow! -- Just like the flow bench numbers indicate!
Pictures of the finished head with the chamber work/cc matching