My L92 heads & LS3 ported intake #s
#1
My L92 heads & LS3 ported intake #s
I want to share my flow numbers of my ported L92 heads and with my LS3 ported stage 2 intake by JeremyF. The heads have been hand port by a local experimented porter.
Stock #s ( I / E )
.100 75 56
.200 151 115
.300 214 155
.400 268 182
.500 294 202
.600 320 204
Ported #s ( I / E / LS3 I)
.100 70 56 73
.200 155 119 156
.300 230 172 222
.400 280 205 265
.500 320 228 290
.600 344 236 307
.650 352 238 312
.700 358 242 318
Runner: Intake ~272cc Exhaust 88cc Chamber 71cc
All flow test were on the same bench with 4.000 bore. I was hoping more cfm with the ported intake but it seems all plastic choke L92 heads...
Heads will be mill .030" to reach around 65cc chamber to have around 10:1. This setup is gonna go on my LY6 short block with a PatrickG custom cam. Hoping between 475-500 rwhp with the 6.0L. Next I'll build a 408 with same setup with around 11:1.. can't wait !
Here's some pictures
The LS3 ported stage 2 with PP fuel rails with my custom brackets to fit my EV1 injectors
And I want tu know if its normal that seals don't sit on the springs seat.
Tell me what you think !! Thanks!!
Stock #s ( I / E )
.100 75 56
.200 151 115
.300 214 155
.400 268 182
.500 294 202
.600 320 204
Ported #s ( I / E / LS3 I)
.100 70 56 73
.200 155 119 156
.300 230 172 222
.400 280 205 265
.500 320 228 290
.600 344 236 307
.650 352 238 312
.700 358 242 318
Runner: Intake ~272cc Exhaust 88cc Chamber 71cc
All flow test were on the same bench with 4.000 bore. I was hoping more cfm with the ported intake but it seems all plastic choke L92 heads...
Heads will be mill .030" to reach around 65cc chamber to have around 10:1. This setup is gonna go on my LY6 short block with a PatrickG custom cam. Hoping between 475-500 rwhp with the 6.0L. Next I'll build a 408 with same setup with around 11:1.. can't wait !
Here's some pictures
The LS3 ported stage 2 with PP fuel rails with my custom brackets to fit my EV1 injectors
And I want tu know if its normal that seals don't sit on the springs seat.
Tell me what you think !! Thanks!!
Last edited by PwrdbyLS1; 01-19-2010 at 08:36 PM. Reason: Runner volume..
#2
You may be in the 475 range. I have something very similar to what your plans are. This includes a new ported LS3 stage 2 by Jeremy. I have PRC heads with hollow valves milled .030 with .030 cometics for my 11.1 CR. I did have Patric G also spec out a cam for me. The cam that made 500rwhp was from my Ls6 head setup. I've yet to slide in his new cam. I'd like to go to a new tunner when I slide it in. I'd like to consider a fast102 but I'm not sure if its worth $$ for an extra 10hp over the ported LS3.
My new plans are when I install the cam, I'm going to have Rich at WCCH port them even more.
My new plans are when I install the cam, I'm going to have Rich at WCCH port them even more.
#6
Yeah need a better tune drivability not very good. My very near future plans is using Pats' cam and Rich at WCCH running his CNC program through my heads. I'd like more work on the exh side. I assume with the cam, head touch up, good tune, I should have over 520wp. I know I would hit the 510-515 range with adding a electric WP.
My current cam was for my Ls6 setup 240/244 108/113 114lsa. Pats' cam is a reverse split.
What I need to get out of my head is going 427 when I pull the heads.
My current cam was for my Ls6 setup 240/244 108/113 114lsa. Pats' cam is a reverse split.
What I need to get out of my head is going 427 when I pull the heads.
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#8
Staging Lane
Join Date: Nov 2006
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The flow numbers are within 1% of the WCCH/L92 stage 2 cnc heads for comparison unless they have changed there program.
Any idea what type of valve jobe was done if so what angles and what back cut on the valve?
Just would like to compare with some work I have done.
Seem like good numbers to me though should be close to your goal GREAT JOB!
hey forgot to mention the exhaust is 10cc smaller than the mention cnc heads.
Any idea what type of valve jobe was done if so what angles and what back cut on the valve?
Just would like to compare with some work I have done.
Seem like good numbers to me though should be close to your goal GREAT JOB!
hey forgot to mention the exhaust is 10cc smaller than the mention cnc heads.
Last edited by SEMI-RETIRED; 01-22-2010 at 09:21 AM. Reason: more info
#9
TECH Junkie
iTrader: (2)
The flow numbers are within 1% of the WCCH/L92 stage 2 cnc heads for comparison unless they have changed there program.
Any idea what type of valve jobe was done if so what angles and what back cut on the valve?
Just would like to compare with some work I have done.
Seem like good numbers to me though should be close to your goal GREAT JOB!
hey forgot to mention the exhaust is 10cc smaller than the mention cnc heads.
Any idea what type of valve jobe was done if so what angles and what back cut on the valve?
Just would like to compare with some work I have done.
Seem like good numbers to me though should be close to your goal GREAT JOB!
hey forgot to mention the exhaust is 10cc smaller than the mention cnc heads.
#10
11 Second Club
iTrader: (37)
Those flow numbers look very similar to a set of L92's I ported a couple years ago (still using them). I never had that engine (387) dyno'd but it ran the times in my signature with a stock unported L76 and an old school single pattern MTI Z1 cam.
I'll be curious to see what kind of hp numbers your 6.0l makes with these heads since my new engine will be an iron block 370 with the ported L92 heads. Looking for a cam now....
Nice work on the porting whoever it was.
Mike
I'll be curious to see what kind of hp numbers your 6.0l makes with these heads since my new engine will be an iron block 370 with the ported L92 heads. Looking for a cam now....
Nice work on the porting whoever it was.
Mike
#11
12 Second Club
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Everyone is "comparing" flow numbers like they are all done on the same flow bench. My flowbench says L92 heads flow 298cfm max, everytime. While others say tey flow 320+ out of the box. When Icheck my calibration with the Superflow checking plate, mine is within .5 cfm on every hole.
Flow numbers are like dynos. To truely compare, the heads need to be flowed on the same bench.
Flow numbers are like dynos. To truely compare, the heads need to be flowed on the same bench.
#12
TECH Apprentice
Join Date: Jan 2008
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Those ex ports look great, High flow small exhaust port works well. I recently heard of a well known CNC head that had a valve guide break and lunched an engine. Good idea not to take to much from there.
#14
11 Second Club
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Everyone is "comparing" flow numbers like they are all done on the same flow bench. My flowbench says L92 heads flow 298cfm max, everytime. While others say tey flow 320+ out of the box. When Icheck my calibration with the Superflow checking plate, mine is within .5 cfm on every hole.
Flow numbers are like dynos. To truely compare, the heads need to be flowed on the same bench.
Flow numbers are like dynos. To truely compare, the heads need to be flowed on the same bench.
My stock unported baseline flow numbers (for the intake side) are damn near a mirror image of his stock unported basline flow numbers. But, my flow bench operator used a pipe on the exhaust side so my exhaust numbers are much higher. It's reasonable, in this case at least, to say that the ported flow numbers for the intake side are a good comparison. If my baseline flow numbers for the intake were skewed significantly from his, then obviously the ported numbers wouldn't compare at all.
My .02.
Mike
#15
I don't have the cash right now for a 408. This is why I build this 6.0L.
I don't know what valve job was done to the heads...
I got my specs for this 6.0L.. A big cam that will work well on a 408
235/243 .621 .624 114LSA +2
I dont know how bad the drivebility can be will my 10:1 compression?
Like a stock LS1 with a Magic stick V3 ??
Do MLS 4.060" gaskets are available with .030 .040 thickness?
Maybe I would bump the compression a little bit to give me a better drivebility!
I don't know what valve job was done to the heads...
I got my specs for this 6.0L.. A big cam that will work well on a 408
235/243 .621 .624 114LSA +2
I dont know how bad the drivebility can be will my 10:1 compression?
Like a stock LS1 with a Magic stick V3 ??
Do MLS 4.060" gaskets are available with .030 .040 thickness?
Maybe I would bump the compression a little bit to give me a better drivebility!
#16
Hmm, those cam specs look interesting...mine is a bit different, not by much. It does seem a little large for a 6.0. I look to slide in the cam and redone heads in April.