The following I found very interesting regarding the flow character of some popular C5 Intake/Head Combos...GMHTP May 2001

Intake/Head Flow@ Lift .200 .300 .400 .500 .550
LS1/Stock LS1 136 184 214 227 229
LS6/Stock LS1 136 186 223 236 241
LS6/Stock LS6 154 204 235 257 263
LS1/Ported LS1 141 185 222 241 251
LS6/Ported LS1 166 211 244 269 277
LS6/Ported LS6 153 202 241 270 280

The article's conclusion was that the best bang-for-the-buck was to use an LS6 intake and ported LS6 Heads.

Any comments?

 

I would probably agree with the article. But my modified Cartek heads & ported LS6 intake flow 225 & 265 @ 300 & 400 respectively. These are the important lift ranges for the street and real fun!

 

Seems to be the consensus that the LS6 ported heads are the best bet. I am using the LQ9 heads which are the same as the LS6, but have a larger cc and are more readily available. Good for s/c when you need to lower the static compression a lil. :cheers:

 

Intel55, I'm very interested to see how it comes out.

 

I will post the flow numbers once they are done. SpeedDemon is doing them. Should take a month or so. They are thier stage IV heads, custom "one off" heads. They should flow big time!

:cheers:





[Modified by intel55, 11:32 PM 12/30/2001]

 

Hey DTSNGIT
How do you know that those heads flow those numbers?? Are they LS1 heads?

Is that with an intake and which one if so?

 

9D9LS1,

The flow numbers are with LS1 heads and ported LS6 intake. Both came from Cartek but were modified at my local speed shop. Hours of re-working and flow testing were done to get to this point. Although I will say the original numbers were not far off where they are now. Cartek does nice work...

 

Heres a more complete breakdown:

<BLOCKQUOTE>code:<HR><PRE>Without Manifolds - Headflow Only:
Cylinder Head Intake Manifold .200" .300" .350" .400" .450" .500" .550" .600"
Stock LS1 N/A 137 187 207 223 228 237 242 243
Stock LS6 N/A 156 204 225 243 257 268 275 278
Ported LS1* N/A 144 200 225 245 261 272 283 292
Ported LS1** N/A 164 217 234 253 270 284 296 305
Ported LS6 N/A 159 212 236 255 272 300 307 314

With Manifolds:
Cylinder Head Intake Manifold .200" .300" .350" .400" .450" .500" .550" .600"
Stock LS1 LS1 136 184 200 214 222 227 229 235
Stock LS1 LS6 136 186 206 223 227 236 241 242
Stock LS6 LS1 156 199 212 224 232 238 243 247
Stock LS6 LS6 154 204 220 235 247 257 263 265
Ported LS1** LS1 141 185 205 222 232 241 251 258
Ported LS1** Truck 163 206 224 237 249 262 265 270
Ported LS1** LS6 166 211 229 244 257 269 277 283
Ported LS6 LS1 156 199 217 230 242 253 263 268
Ported LS6 LS6 153 202 222 241 257 270 280 289</PRE>[/QUOTE]

* Original Stage II heads from New Dog, Old Tricks; GMHTP May/July 2000

** Latest revision.

Info originally from Chris Endres