Out of box VS ported L92s
great
Originally Posted by edcmat-l1
Cam only results shortly. May be monday before we have head comparison #s
Me or Kevin will post them just as soon as there on the screen
Me or Kevin will post them just as soon as there on the screen
Originally Posted by fastGBcamaro
I'm really looking forward to seeing these numbers. I was thinking about making a thread exactly like this one. I am starting to think that unless you are doing a FI setup the cnc L92 heads might be over kill and will only hurt performance on a na motor, because of the lower port velocity. I really hope that the sponcers start coming out with some great numbers using these heads in the very near future. Its getting close to spring here and I still have a lot of engine work to do. With the flow numbers that the L92's make stock you should be able to EASILY make 500rwhp with the right cam choice and over 400+ ci, but so far there havent been very many people to get to 500.
Heads are coming off now. Should have results on monday.
Originally Posted by fastGBcamaro
I'm really looking forward to seeing these numbers. I was thinking about making a thread exactly like this one. I am starting to think that unless you are doing a FI setup the cnc L92 heads might be over kill and will only hurt performance on a na motor, because of the lower port velocity. I really hope that the sponcers start coming out with some great numbers using these heads in the very near future. Its getting close to spring here and I still have a lot of engine work to do. With the flow numbers that the L92's make stock you should be able to EASILY make 500rwhp with the right cam choice and over 400+ ci, but so far there havent been very many people to get to 500.
Originally Posted by edcmat-l1
Have you seen the other thread? We're right there. 490 with a 3.90 gear, thru cats, etc, etc.
Heads are coming off now. Should have results on monday.
Heads are coming off now. Should have results on monday.
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Originally Posted by My90Iroc
Has any work been done to the intake?
Has the intake been flowed?
Can the heads be flowed with the intake hooked up?
Has the intake been flowed?
Can the heads be flowed with the intake hooked up?
Originally Posted by 1bigcam
will a ported l76 help that? ls2portworks says they port them.
I'm going to get the stock heads cleaned up monday, and get some pictures and measurements of both heads, to get a good comparison.
Originally Posted by edcmat-l1
I dont know if porting (the intake) would help. I know most of the CNC work on the heads was done in the exhaust ports. We may try the intake like it is and then port it. All depends on how much time we are given.
I'm going to get the stock heads cleaned up monday, and get some pictures and measurements of both heads, to get a good comparison.
I'm going to get the stock heads cleaned up monday, and get some pictures and measurements of both heads, to get a good comparison.
Originally Posted by My90Iroc
The link in post #7 implies you're using those heads where intake work was done. That's why I was asking about having the intake flowed.
But I undrstand what you are asking about. It would be interesting to see some flow #s on the intake/head combo. Hopefully those will be available soon.
Originally Posted by My90Iroc
The link in post #7 implies you're using those heads where intake work was done. That's why I was asking about having the intake flowed.
Originally Posted by edcmat-l1
Intake port work in the HEADS, not the MANIFOLD.
But I undrstand what you are asking about. It would be interesting to see some flow #s on the intake/head combo. Hopefully those will be available soon.
But I undrstand what you are asking about. It would be interesting to see some flow #s on the intake/head combo. Hopefully those will be available soon.
On The Tree
Joined: Aug 2003
Posts: 100
Likes: 0
From: Arlington, Tx
Originally Posted by edcmat-l1
Cam only results shortly. May be monday before we have head comparison #s
Me or Kevin will post them just as soon as there on the screen
Me or Kevin will post them just as soon as there on the screen
Any news yet??? Inquiring minds want to know!
Originally Posted by 2k2blkss
Any news yet??? Inquiring minds want to know!
Back to my post #12 in this thread I still don't think the combination of the stock intake and these heads will work well together. I also believe porting the intake ports of these heads will magnify the problem of low velocity through the heads and poor flow through the intake. I'd like to see a custom intake put on this setup and see what happens. None the less, I understand the point of the build and looking at that dyno graph the car should be real fun to drive.
On a side note, hats off to wcch. It looks like there's a ton of material that can be taken out of the exhaust ports on these heads which has been proven to really be lacking. I think we're going to see a lot of L92 heads with only exhaust port work done while leaving the intake ports alone.
People keep talking about finding the right cam "for the heads" but IMO it goes beyond that. Other cam profiles will probably help some but I don't think you'll see the leaps and bounds in power gains like we did from cam profiles on the 346. Until an intake comes out that will keep up with these heads you're fighting a major bottleneck. It's like putting a coffee stirrer in your mouth then putting a regular straw at the other end and blowing through the coffee stirrer. You know the straw flows well but the stirrer doesn't so your stuck. The desparity in flow between the L76 intake and L92 heads seems much greater than LS1/LS6 intake and LS1/LS6 heads. Just my opinion.
On a side note, hats off to wcch. It looks like there's a ton of material that can be taken out of the exhaust ports on these heads which has been proven to really be lacking. I think we're going to see a lot of L92 heads with only exhaust port work done while leaving the intake ports alone.
People keep talking about finding the right cam "for the heads" but IMO it goes beyond that. Other cam profiles will probably help some but I don't think you'll see the leaps and bounds in power gains like we did from cam profiles on the 346. Until an intake comes out that will keep up with these heads you're fighting a major bottleneck. It's like putting a coffee stirrer in your mouth then putting a regular straw at the other end and blowing through the coffee stirrer. You know the straw flows well but the stirrer doesn't so your stuck. The desparity in flow between the L76 intake and L92 heads seems much greater than LS1/LS6 intake and LS1/LS6 heads. Just my opinion.
Originally Posted by My90Iroc
Back to my post #12 in this thread I still don't think the combination of the stock intake and these heads will work well together. I also believe porting the intake ports of these heads will magnify the problem of low velocity through the heads and poor flow through the intake. I'd like to see a custom intake put on this setup and see what happens. None the less, I understand the point of the build and looking at that dyno graph the car should be real fun to drive.
On a side note, hats off to wcch. It looks like there's a ton of material that can be taken out of the exhaust ports on these heads which has been proven to really be lacking. I think we're going to see a lot of L92 heads with only exhaust port work done while leaving the intake ports alone.
People keep talking about finding the right cam "for the heads" but IMO it goes beyond that. Other cam profiles will probably help some but I don't think you'll see the leaps and bounds in power gains like we did from cam profiles on the 346. Until an intake comes out that will keep up with these heads you're fighting a major bottleneck. It's like putting a coffee stirrer in your mouth then putting a regular straw at the other end and blowing through the coffee stirrer. You know the straw flows well but the stirrer doesn't so your stuck. The desparity in flow between the L76 intake and L92 heads seems much greater than LS1/LS6 intake and LS1/LS6 heads. Just my opinion.
On a side note, hats off to wcch. It looks like there's a ton of material that can be taken out of the exhaust ports on these heads which has been proven to really be lacking. I think we're going to see a lot of L92 heads with only exhaust port work done while leaving the intake ports alone.
People keep talking about finding the right cam "for the heads" but IMO it goes beyond that. Other cam profiles will probably help some but I don't think you'll see the leaps and bounds in power gains like we did from cam profiles on the 346. Until an intake comes out that will keep up with these heads you're fighting a major bottleneck. It's like putting a coffee stirrer in your mouth then putting a regular straw at the other end and blowing through the coffee stirrer. You know the straw flows well but the stirrer doesn't so your stuck. The desparity in flow between the L76 intake and L92 heads seems much greater than LS1/LS6 intake and LS1/LS6 heads. Just my opinion.
Richard
TECH Fanatic
Joined: Mar 2003
Posts: 1,946
Likes: 1
Originally Posted by Richard@WCCH
I believe you've said it best so far. The L76 intake flows no better than a factory LS6. This power problem is nearly identical to the problem the trucks are having. The truck intake equalizes power in a modded 5.3l and 408 at around 350rwhp. Very few exceptions to this. However, once a Victor Jr. intake is installed, the 408 soars with power. It's not unreasonalbe to believe that GM developed the L76 intake to produce lots of low end torque with a 208º cam and wasn't thinking about the guy building a hot 408 with a 240º+ cam buzzing 6500+rpms. Why isn't this more obvious? Virtually every customer I've spoken to who have installed a Hogan's sheet metal or Wilson billet intake has seen anywhere from 40 to 80 more hp. And depending on design, more peak torque with little to no loss of low end torque. Sadly the Gen 3 hot rod community has been let down by the companies who manufacture intake manifolds. To date none have come to market with a performance oriented intake that breaks the cookie mold of the turtleback style manifold. Victor Jr. intakes are not practical to use on C5/C6 and F-body cars. We've reached the next bottleneck with the L92 top end and that's the L76 intake manifold.
Richard
Richard
