The Good Head Thread!
#1
Safety Car
Thread Starter
The Good Head Thread!
I'm going to be researching the different heads out there, can you post up any flow numbers with matching heads that you have or can find? I'm ultimately trying to compare ported LS6 heads to the aftermarket heads out there.
Also any differences in valve sizes and materials. I know AFR uses valve materials that reduce the risk of a valve float.
Can AFR's be ported further?
AFR 205cc Intake valve 2.020" Exhaust Valve 1.600"
Lift Intake Exhaust
.200 145 121
.300 210 173
.400 257 208
.500 290 223
.600 308 233
TRICKFLOW 215cc LS1 Heads Intake valve 2.040" Exhaust Valve 1.575"
Lift Intake Exhaust
.200 142 115
.300 215 185
.400 260 230
.500 300 251
.600 320 259
Dart PRO1 205cc LS1 Heads Intake Valve 2.020" Exhaust Valve 1.600"
Lift Intake Exhaust
.200 156 109
.300 215 154
.400 258 187
.500 290 205
.550 296 210
Patriot Performance LS6 Style Stage II Heads Intake valve 2.020" Exhaust Valve 1.570"
They also have a 2.055"/1.57" available but no flow numbers, probably better flow on the intake side
Lift Intake Exhaust
.200 140 124
.300 202 160
.400 244 196
.500 280 220
.550 291 226
.600 304 229
Edelbrock 202cc Intake valve 2.020" Exhaust Valve 1.57"
Lift Intake Exhaust
.200 141 115
.300 200 162
.400 245 196
.500 282 208
.550 294 213
.600 300 217
Also any differences in valve sizes and materials. I know AFR uses valve materials that reduce the risk of a valve float.
Can AFR's be ported further?
AFR 205cc Intake valve 2.020" Exhaust Valve 1.600"
Lift Intake Exhaust
.200 145 121
.300 210 173
.400 257 208
.500 290 223
.600 308 233
TRICKFLOW 215cc LS1 Heads Intake valve 2.040" Exhaust Valve 1.575"
Lift Intake Exhaust
.200 142 115
.300 215 185
.400 260 230
.500 300 251
.600 320 259
Dart PRO1 205cc LS1 Heads Intake Valve 2.020" Exhaust Valve 1.600"
Lift Intake Exhaust
.200 156 109
.300 215 154
.400 258 187
.500 290 205
.550 296 210
Patriot Performance LS6 Style Stage II Heads Intake valve 2.020" Exhaust Valve 1.570"
They also have a 2.055"/1.57" available but no flow numbers, probably better flow on the intake side
Lift Intake Exhaust
.200 140 124
.300 202 160
.400 244 196
.500 280 220
.550 291 226
.600 304 229
Edelbrock 202cc Intake valve 2.020" Exhaust Valve 1.57"
Lift Intake Exhaust
.200 141 115
.300 200 162
.400 245 196
.500 282 208
.550 294 213
.600 300 217
Last edited by Z06Electron; 09-21-2007 at 03:36 PM.
#2
Safety Car
Thread Starter
Also will combustion chamber size affect the flow results? Do the different size valves effect anything after the flow numbers, or do they contribute to the flow numbers already recorded?
#3
Team Owner
The TFS are the hot ticket right now, and you can see why. Runners are slightly bigger than AFR 205 (215cc), intake flow is correspondingly slightly better, but the exhaust flow is significantly better. Pick the right cam to go with those heads, and you can reach and surpass 500rwhp on the stock bottom end with all the extra bolt-ons. (FAST90/90, water pump, good headers, etc.)
#5
Team Owner
If you wanted edlebrock, TSP sells "terminator' heads which are modified edlebrock heads, with 200cc intake runners.
#6
Team Owner
Ported ls6 heads, no matter what peak numbers they may be able to attain, are inferior in the lower rpm ranges to aftermarket head designs like AFR or TFS. They achieve their flow through very large intake runners, much larger than 205 or 215cc, which hurts velocity.
If on a budget, I would go with the Darts over ls6 heads. If money is not an issue, TFS or AFR without a doubt. Whenever I change heads I plan on running AFR 225 small bore heads or the TFS 215cc heads, provided I stay with the stock displacement.
If on a budget, I would go with the Darts over ls6 heads. If money is not an issue, TFS or AFR without a doubt. Whenever I change heads I plan on running AFR 225 small bore heads or the TFS 215cc heads, provided I stay with the stock displacement.
#7
Safety Car
Thread Starter
Ported ls6 heads, no matter what peak numbers they may be able to attain, are inferior in the lower rpm ranges to aftermarket head designs like AFR or TFS. They achieve their flow through very large intake runners, much larger than 205 or 215cc, which hurts velocity.
If on a budget, I would go with the Darts over ls6 heads. If money is not an issue, TFS or AFR without a doubt. Whenever I change heads I plan on running AFR 225 small bore heads or the TFS 215cc heads, provided I stay with the stock displacement.
If on a budget, I would go with the Darts over ls6 heads. If money is not an issue, TFS or AFR without a doubt. Whenever I change heads I plan on running AFR 225 small bore heads or the TFS 215cc heads, provided I stay with the stock displacement.
Has AFR made any 215cc's or can they? Tony could jump on here if he sees this thread. I imagine they would flow better than the TFS's if they had. And the Spring upgrade for the AFR's is only $100, so the price difference would be insignificant.
If AFR makes the small bore 225's, then this would seem to be the way to go, as even the 205's do flow close to the 215's down low. Are these the same price? Special Order?
Last edited by Z06Electron; 09-21-2007 at 10:28 PM.
#8
Safety Car
Thread Starter
#9
Team Owner
Tony's on vacation until early next month (back east). It is definitely a cost trade-off. I bought the Darts when they first came out but really wanted the AFR's. I knew I left power on the table with the decision. This winter, I plan to upgrade from the Darts to the AFR's. Darts are "as cast" and are a nice head with good parts, but I believe you won't make as much power with them compared to a good CNC head like the AFR. Bottom line is you can't go wrong with the AFR head, unless your budget doesn't allow for it. I like messing with my car so swapping out the heads in the spring will be part adventure as well
#10
Safety Car
Thread Starter
Tony's on vacation until early next month (back east). It is definitely a cost trade-off. I bought the Darts when they first came out but really wanted the AFR's. I knew I left power on the table with the decision. This winter, I plan to upgrade from the Darts to the AFR's. Darts are "as cast" and are a nice head with good parts, but I believe you won't make as much power with them compared to a good CNC head like the AFR. Bottom line is you can't go wrong with the AFR head, unless your budget doesn't allow for it. I like messing with my car so swapping out the heads in the spring will be part adventure as well