L92 Intake Runner Size??
11 Second Club
Joined: May 2007
Posts: 226
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From: Sydney
Theres nothing wrong with the L92's on a 6.0l motor. We have plenty of em here in oz . That setup has been standard here for over 2 years now with some guys starting to make good numbers with the right cam setup. There is probably a way to go before someone hits on a killer cam combo but TBH in stock form with just a cam and exhaust change we found probably 130 rwhp. I will be swapping my stack L92's for a ported set after christmas and hopefull pick up another 25 rwhp but with more low down torque.
cheers
cheers
Theres nothing wrong with the L92's on a 6.0l motor. We have plenty of em here in oz . That setup has been standard here for over 2 years now with some guys starting to make good numbers with the right cam setup. There is probably a way to go before someone hits on a killer cam combo but TBH in stock form with just a cam and exhaust change we found probably 130 rwhp. I will be swapping my stack L92's for a ported set after christmas and hopefull pick up another 25 rwhp but with more low down torque.
cheers
cheers
i've seen a couple of people with the L92s on 6.0 motors,post good results..it's all in the right cam choice..those heads don't like a lot of overlap, from what i've seen on the message boards anyways..which makes sense because of the big intake valves and ports..
there's a guy on LS2GTO.com that did this swap recently. he made good power down low,only at 1500rpms and below did he lose anything..i think the cam he used was around a 228/232,114lsa..it was ground specifically for the L92 heads..
i just swapped to the L92's and a larger cam a few weeks ago on my 6.0 s-10,, i thought for sure id loose a lot of low end and driveability(going from 241's, a small cam and dual plane intake to a single plane intake and larger cam),, but no,, this 6.0 with L92 heads runs great, driving around town is almost the same, idle is good at 850rpm and wow from 4000-7500rpm it pulls very hard
i used the same cam as the carcraft 6.0 build:
http://www.carcraft.com/techarticles...ads/index.html
.
i used the same cam as the carcraft 6.0 build:
http://www.carcraft.com/techarticles...ads/index.html
.
Thread Starter
TECH Apprentice
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From: New Hampshire
Thats what I needed to hear!!! Yeh I have that same article and what I plan to follow. Did you use the GMPP cam or the Comp Cam for your swap?? I think now from hearing the other post that I will stick with my original plan to do the L92's. Thanks!!!
PS Jay , could you send me a pic of your belt set-up?
PS Jay , could you send me a pic of your belt set-up?
Last edited by bluethunder364; Nov 10, 2007 at 08:23 AM. Reason: addition
Sure u could make an arguement for a 4in bore engine but again I'll take a LS6 opened to a 4in bore and a lighter valve train...
I can get ETP to completely cnc and setup a 243 head for under 1400.00....
I can port my own LS2 intake myself
This setup would probably cost alittle more than throwing on a L92/L76 setup but it would make IMO as much or more power as the L92 setup on a 364CI
Once u get to a bigger bore,L92's would be nice....The best things about the L92 stuff is u dont really need to port the intake runner,just the exhust runner but I still dont like the heavy valvetrain..
JMHO...
I can get ETP to completely cnc and setup a 243 head for under 1400.00....
I can port my own LS2 intake myself
This setup would probably cost alittle more than throwing on a L92/L76 setup but it would make IMO as much or more power as the L92 setup on a 364CI
Once u get to a bigger bore,L92's would be nice....The best things about the L92 stuff is u dont really need to port the intake runner,just the exhust runner but I still dont like the heavy valvetrain..
JMHO...
Sure u could make an arguement for a 4in bore engine but again I'll take a LS6 opened to a 4in bore and a lighter valve train...
I can get ETP to completely cnc and setup a 243 head for under 1400.00....
I can port my own LS2 intake myself
This setup would probably cost alittle more than throwing on a L92/L76 setup but it would make IMO as much or more power as the L92 setup on a 364CI
Once u get to a bigger bore,L92's would be nice....The best things about the L92 stuff is u dont really need to port the intake runner,just the exhust runner but I still dont like the heavy valvetrain..
JMHO...
I can get ETP to completely cnc and setup a 243 head for under 1400.00....
I can port my own LS2 intake myself
This setup would probably cost alittle more than throwing on a L92/L76 setup but it would make IMO as much or more power as the L92 setup on a 364CI
Once u get to a bigger bore,L92's would be nice....The best things about the L92 stuff is u dont really need to port the intake runner,just the exhust runner but I still dont like the heavy valvetrain..
JMHO...
for a purpose built street motor under 400ci,i agree the LS6 heads are the way to go,but someone might prove me wrong in the future...
Yea I agree too,I just cant see the logic in going L92 if u already have a 6.0 w/243's on it...Of course if u are building a 400+ in engine then by all means the bigger heads will shine 
I think this depends on rpm,size of engine and camshaft design.To say they make the LS6 look like **** is a stupid comment,I would think on a 346 to 400 CI that a PORTED LS6 is more then enough head to make 500RW and better overall power/tq than a L92 from a data point of 3000 to 6800....
BTW: My WCCH Stage 2 heads have a 270cc intake runner.
The car drives like stock and I use it often in bumper to bumper DC traffic.
Whats your point,I never said they wouldnt work on your 4.030/4.00 setup
Its a 403 and hase a longer stroke so this engine can use the larger L92 stuff but on a 4.00/3.62 I'm not so sure there any better than correctly ported LS6 heads.
Its a 403 and hase a longer stroke so this engine can use the larger L92 stuff but on a 4.00/3.62 I'm not so sure there any better than correctly ported LS6 heads.
A 403 is 4.005x4.00. I didn't realize you were making a distiction between a 400CI engine and a 403CI.
TECH Fanatic
Joined: Oct 2007
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From: Ventura County, California
Matt and VH5150, Thanks for your input, I did read an earlyer post stating that is the correct size......Wow I was a little concerned but you have put my Chevy brain to rest!!!
I will call on you Matt for your assistance. I plan to order the L92's as soon as I gather up the funds. I will need help in the cam selection process. I plan aslo to run an 850 DP with the stand alone MSD controller. I have the Hot Rod magazine write up to follow to some degree. Another area of concern is wheather to run a daul plain or single plain intake. I know the single will make a little more power. Just want to make sure it is streetable. Pls feel free to advise. Thanks....Chris
I will call on you Matt for your assistance. I plan to order the L92's as soon as I gather up the funds. I will need help in the cam selection process. I plan aslo to run an 850 DP with the stand alone MSD controller. I have the Hot Rod magazine write up to follow to some degree. Another area of concern is wheather to run a daul plain or single plain intake. I know the single will make a little more power. Just want to make sure it is streetable. Pls feel free to advise. Thanks....Chris
I ran 10.30's on motor with than carb with a 377 sbc.
I talked to a lot of people and one was kenny duttweiler who did a lot of dyno testing on motors with that carb and said it worked great on a lot of applications.
The l92 heads are stock on the 6.2 corvette and escalade engines and make great power, do not have low speed torque issues and respond very well to intake and exhaust mods...When things do not fit into our mindset we can figure out what it is we do not understand or stick to what we think we know and loose the chance to become a little more intelligent.
The l92 heads are stock on the 6.2 corvette and escalade engines and make great power, do not have low speed torque issues and respond very well to intake and exhaust mods...When things do not fit into our mindset we can figure out what it is we do not understand or stick to what we think we know and loose the chance to become a little more intelligent.
my point was one mainly of cost..i already have 243s..it would cost about 1500.00 to get them ported..rough number,but you get the idea..
if i wanted to go with the L92s,then i have to buy the intake and upgraded valvetrain to go with them,plus any machine work that might be needed..which will be well north of the 1500.00 by the time i'm done,with similar results for my goals..(6.0,smaller cam,6000rpm peak power)looking at cost per hp,for my goals i can't justify it..
Teching In
Joined: Jul 2007
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Every back to back dyno run I have seen on a 6.0 the L92 makes more power above 4500rpm but at the expense of power below. Before deciding on the L92 heads one also has to consider if you you want to make your power further up. I also think a ported 243 has a shot at making more average power.
Gm high performance did a 6.0 with L92's and it made real nice numbers. Now were not talking about going into the 8,9,10's but really how many people on this site are? For the dollar you should go with ls6 heads as you can get a pair cheap from one of the vendors. That is unless you EVER think you might want to go bigger. Then I'd hit up the L92's and talk to a sponsor about getting as much out of it as you can.
L92's are going on my 402 as well. This will be a new trick for me as I've always been a big lover of the small port high velocity theory... The old SBC mentality is a tough one to break.
L92's are going on my 402 as well. This will be a new trick for me as I've always been a big lover of the small port high velocity theory... The old SBC mentality is a tough one to break.
I think the L92 set-up is a good choice if building ground up on a middle line budget 6.0 that can be up graded later, poked, stroked. If something better comes out later you have about $800 in the heads and $180 or so in springs, not a ton invested.
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TECH Apprentice
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From: New Hampshire
I agree!!! I may have a little more head (l92 that is) LOL than I need right now, but if I decide later to bore- stroke etc. I'll have what I need on top. I got my L92's stripped to save me even more $ and I can select what components I want. Mine won't be a crazy all out build but it should put my RX 7 into the low 11's easy as I'm running 12 .0 flat with a mild build Vortec 350 now.
