Ported LS7 Flow numbers
Congratulations Greg! Nice work improving your LS7 heads and intake. 
Now that it's running the fun begins!!
Thanks for posting your progress. Have fun friend, you've earned it.
Richard
Now that it's running the fun begins!!
Thanks for posting your progress. Have fun friend, you've earned it.
Richard
On The Tree
Joined: Aug 2005
Posts: 132
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Originally Posted by Greg Fell
Where the 2 pieces mate together, 'required' (he he he) smoothing and such. There were ridges in them. Also, the injector bosses were not very consistent from one cyl to the other, they needed massaged also. Finally, since I milled the heads .040, the nipple/locator dealios on either side of the manifold required some clearancing.
Update....the car is ALIVE! Started right up... quiet valvetrain (aggresive cam), 50+ psi hot at idle, man am I happy.
Update....the car is ALIVE! Started right up...
quiet valvetrain (aggresive cam), 50+ psi hot at idle, man am I happy.That is very little work for such impressive results. Congrats on your set-up. I look forward to some dyno numbers.
TECH Apprentice
Joined: Oct 2004
Posts: 329
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got more flow at a .400" lift point than the ported ls6/fast90 combinations.
At the .600" lift point have more intake/head flow than ls6 ported heads without an intake.
Its going to be an interesting one to say te least, even with a moderate camshaft should do well. with a high lifting good duration, and all supporting cast we should see huge numbers.
At the .600" lift point have more intake/head flow than ls6 ported heads without an intake.
Its going to be an interesting one to say te least, even with a moderate camshaft should do well. with a high lifting good duration, and all supporting cast we should see huge numbers.
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Originally Posted by Greg Fell
I had Jay @ Jay Riddle Racing (www.jayriddleracing.com) hand finish my GM LS7 heads. Based on what so many people have said, I was hesitant to have anyone touch the superb GM factory casting, with regards to porting and such. After consulting with Jay, and based on his years of experience with high performance heads, he was confident he could really wake these up. Needless to say, I was very surprised and pleased with the results. Cant wait to hit the rollers and the track. This is on a resleeved 5.3 L alum block, 4.100 x 4.00 422". We also went through the whole motor, and hand crafted the pistons to accomodate the 12* heads, and offset guide spacing.
4.100 bore flowed at true 28" vacuum.
intake
lift ported stock ported w ported intake
.100 77 69 n/a
.200 162 166 n/a
.300 259 245 259
.400 314 299 307
.500 352 340 326
.600 376 362 347
.650 386 360 356
.670 388 n/a 363
.700 392 360 367
exhaust (flowed reverse through kooks 1 7/8 header)
lift ported
.100 58
.200 121
.300 167
.400 208
.500 243
.600 252
.650 256
4.100 bore flowed at true 28" vacuum.
intake
lift ported stock ported w ported intake
.100 77 69 n/a
.200 162 166 n/a
.300 259 245 259
.400 314 299 307
.500 352 340 326
.600 376 362 347
.650 386 360 356
.670 388 n/a 363
.700 392 360 367
exhaust (flowed reverse through kooks 1 7/8 header)
lift ported
.100 58
.200 121
.300 167
.400 208
.500 243
.600 252
.650 256
what was the intake runner volume before porting and after porting?
what about the exhaust runner also?
thanks.
TECH Apprentice
Joined: Oct 2004
Posts: 329
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GregFell,
We all can see that the ported LS7 intake to heads numbers are great,
what 327CFM@.5" with intake mani attached and 347@.6".
Most of the Fast90 combinations where 290CFM tops, even witha 350CFM head attached.
We never did see a dyno number.
Was wondering if you got a dyno number or track number out of this?
Dennis
We all can see that the ported LS7 intake to heads numbers are great,
what 327CFM@.5" with intake mani attached and 347@.6".
Most of the Fast90 combinations where 290CFM tops, even witha 350CFM head attached.
We never did see a dyno number.
Was wondering if you got a dyno number or track number out of this?
Dennis
I ran 6.91 @ 102 in the 1/8, haven't had it at the 1/4 yet (there was a BAD accident that day, and the track got hosed up). I'm guessing that was 10.7 or so. I was hoping for better.
I did dyno it, however it didn't make good power at all (in fact, very poor), so I'm not going to post them. I'm pretty certain I overcammed it and didn't have enough compression for it, its not making very good power at all. Very soft. I have a new cam in the mail. The torque curve looks great as far as shape, its just very soft. FWIW, my cranking compression was ~ 180-185.
I'll look for the flow numbers with the manifold.
What are you guys running for cams, on the LS7 heads? I would have bought an LG cam, but the guy I talked to didn't seem to understand any questions I was asking, and I'm not going to pay $440 for a cam when I can get one for $100 cheaper and I know what I'm getting that way.
I did dyno it, however it didn't make good power at all (in fact, very poor), so I'm not going to post them. I'm pretty certain I overcammed it and didn't have enough compression for it, its not making very good power at all. Very soft. I have a new cam in the mail. The torque curve looks great as far as shape, its just very soft. FWIW, my cranking compression was ~ 180-185.
I'll look for the flow numbers with the manifold.
What are you guys running for cams, on the LS7 heads? I would have bought an LG cam, but the guy I talked to didn't seem to understand any questions I was asking, and I'm not going to pay $440 for a cam when I can get one for $100 cheaper and I know what I'm getting that way.
Last edited by Greg Fell; Oct 27, 2006 at 08:19 PM.
Originally Posted by gtovan
Greg,
Maybe look at the GMPP Grand-Am Cup cam as a reference 239/251 106 LSA ICL 47.
XE-R 236/248 110+2. I think that would put you in the ballpark.
Maybe look at the GMPP Grand-Am Cup cam as a reference 239/251 106 LSA ICL 47.
XE-R 236/248 110+2. I think that would put you in the ballpark.
Nate
On The Tree
Joined: May 2005
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Originally Posted by Big-DEN
gtovan - I see 535rwhp/503rwtq thru an A4.
I just noticed 455 cubic inches.
I just noticed 455 cubic inches.
Last edited by gtovan; Oct 27, 2006 at 09:31 PM.