799 heads any flow numbers

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May 3, 2010 | 10:41 PM

12Racing

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From: Baton Rouge, LA

799 heads any flow numbers

does anyone have any flow numbers on these heads???

May 3, 2010 | 11:06 PM

trever1t

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they should flow identical to 243's.

May 4, 2010 | 12:11 AM

max1

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^ i think he meant flow bench numbers..

May 4, 2010 | 12:55 AM

Dirty 30

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btw, i noticed the stock 799 heads in my Envoy had some spots/places in the intake runners that had been ported out or smooth out by a hand dremel. I always wondered if it was just my truck or something to do with the DOD.

May 4, 2010 | 08:03 AM

Preston129

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Closest you're going to find are flow numbers from the LS6 243s, which have slightly bigger bore and valves, so expect 5.3 specific 243/799 heads to flow just slightly less.

From LS1tech,

Quote:

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

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

May 4, 2010 | 10:31 AM

Dirty 30

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You sure about the valves being bigger? I could have sworn mines were the same as any LS6 head.

May 4, 2010 | 10:49 AM

Preston129

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Quote:

Originally Posted by Dirty 30

You sure about the valves being bigger? I could have sworn mines were the same as any LS6 head.

My mistake, you're right. All 243 heads have 64.45cc combustion chambers, 2.00" I and 1.55" E valves. The ones from the LS6 have sodium filled valves.