l92 heads on lq9 6.0

i been reading and understanding this artical from hotrod mag.

How to Add Horsepower to GM's 6.0L Ls-Series Small-Block - Hot Rod Magazine


but what i am getting is the stock lq9 bore is 4" (or is it smaller) which is marginal for the l92 heads. i guess my questions would be how marginal? i do understand the l76 intake would need to be used or the fast90 ( wonder if theres any others) and some bracketery from a camero, none of this is not obtainable. can be done rather cheaply, anyway gonna read and research more into this as it seems like a postive route to go in... if its as promising as it seems..


anyway just some thinking out load and any input is more than welcome!!!!

L92 heads would fit on your LQ9. You can use the L92 truck intake, the L76 car intake and a wieand and fast 92 will be out soon for the heads. with the heads decked you could obtain you stock compression back. I would suggest a stage 1 P and P on the heads with stock short block. You would not have to change any accessories with the L92 truck intake, or you can go to gto accessories (about $500) if you use the car intakes.

Quote:

---

Originally Posted by DBTBSS

L92 heads would fit on your LQ9. You can use the L92 truck intake, the L76 car intake and a wieand and fast 92 will be out soon for the heads. with the heads decked you could obtain you stock compression back. I would suggest a stage 1 P and P on the heads with stock short block. You would not have to change any accessories with the L92 truck intake, or you can go to gto accessories (about $500) if you use the car intakes.

---

thanks for the info bro, much appreciated, my concern was making sure i didnt have any valve shrouding..so basically understanding the artical and your post, this wouldnt be a bad setup? yes i was planning on having a port and polish done. i also noticed theyre really not that expensive, my thoughts were going this route or the 243 heads from patriot.. jsut trying to figure out whats the best bang for the buck!!!!

p.s. thanks again, gonna do somemore research

Just my opinion, unless you can bump the CR up to around 11 to 1,or add FI, or spray, they might be a little sluggish on the bottom. They are very nice heads for $350; for bare castings. Any head that flows 320int./230exh. out of the box is pretty damn good. The exhaust flow needs a little help, thats where the P/P would come in. I would port the exhaust side and just clean up the intake side if I were putting them in a LQ9 or a LS2. Ported 243's aren't bad pieces either for what you have. If you go with L92's I would suggest another cam than what you have, with that said a cam is just adding more $$$ to the best bang for the buck for you. :twocents:

Quote:

---

Originally Posted by DBTBSS

Just my opinion, unless you can bump the CR up to around 11 to 1,or add FI, or spray, they might be a little sluggish on the bottom. They are very nice heads for $350; for bare castings. Any head that flows 320int./230exh. out of the box is pretty damn good. The exhaust flow needs a little help, thats where the P/P would come in. I would port the exhaust side and just clean up the intake side if I were putting them in a LQ9 or a LS2. Ported 243's aren't bad pieces either for what you have. If you go with L92's I would suggest another cam than what you have, with that said a cam is just adding more $$$ to the best bang for the buck for you. :twocents:

---

thanks, yes i was gonna go with another cam also, just hadnt decided on what size was thinking somewere in the 230+ 600 lift max range, any thoughts on this one?

Quote:

---

Originally Posted by skeet

thanks, yes i was gonna go with another cam also, just hadnt decided on what size was thinking somewere in the 230+ 600 lift max range, any thoughts on this one?

---

we had my L92's decked to 62cc chambers and ran a LPE GT-11 cam on my LS2 that went 7.68 @ 89.11 in the 1/8th.....

the cam is 215/231 .631"/.644" with 1.7 ratio rockers an has a 118 LSA....we ran shorter push rod and no issues.....it was a MONSTER on the street and ran rediculously fast at the track......

just some input from been there done that.....i have gone to the stroker now and kept the L92 top end.....just badass.....

if i had it to do all over again i woul use these cam specs......

225/230 590/610 with 110 ICL 114 LSA with 4 degree cam advance on the COMP LSK Lobe....the 118 LSA was just too flat off the line for me i geared my truck down to get the best out of the setup which was probably the wrong thing to do.....a different cam would have been cheaper and worked better......



EDIT: where ever you land on the cam specs the duration over lap needs to be minimized on these heads and the lift split maintained.....this will increase cylinder pressures on the bottom to increase torque and the top end will alwyas flow with these heads do to the rrunner size

Quote:

---

Originally Posted by freemaSSon

we had my L92's decked to 62cc chambers and ran a LPE GT-11 cam on my LS2 that went 7.68 @ 89.11 in the 1/8th.....

the cam is 215/231 .631"/.644" with 1.7 ratio rockers an has a 118 LSA....we ran shorter push rod and no issues.....it was a MONSTER on the street and ran rediculously fast at the track......

just some input from been there done that.....i have gone to the stroker now and kept the L92 top end.....just badass.....

if i had it to do all over again i woul use these cam specs......

225/230 590/610 with 110 ICL 114 LSA with 4 degree cam advance on the COMP LSK Lobe....the 118 LSA was just too flat off the line for me i geared my truck down to get the best out of the setup which was probably the wrong thing to do.....a different cam would have been cheaper and worked better......



EDIT: where ever you land on the cam specs the duration over lap needs to be minimized on these heads and the lift split maintained.....this will increase cylinder pressures on the bottom to increase torque and the top end will alwyas flow with these heads do to the rrunner size

---

thanks for the input FM, yeah also keeping into concideration that this is an ECSB, so the lsa12 would be feasiable?

lower lift with TIGHTER LSA is your friend with the weight we all have and if you degree the cam it brings the torque on even earlier......

but it seems you are already leaning that way.......lower duration with larger lift increases the cylinder pressures and the DYNAMIC COMPRESSION is what gives you torque and with the L92's the heads flow TOO fast with that MONSTER intake runner, the trick is getting the head velocity to SLOW and build dynamic compression to build torque.....make sure you talk to as many cam ENGINEER/BUILDERS as possible to get the right cam combo for the L92 but not on the head but the head installed with the HUGE WEIGHT......

gm used a reverse split to SLOW DOWN head velocity and increase dynamic compression, which works but it is crap for anything after about 5500 rpm's......

my bride has an '08 escalade and it is just rediculous off idle but dies at 5000, just falls off COMPLETELY...the factory shift point are like 5500 rpms....and it is all centered around that reverse split....

Quote:

---

Originally Posted by skeet

thanks, yes i was gonna go with another cam also, just hadnt decided on what size was thinking somewere in the 230+ 600 lift max range, any thoughts on this one?

---

224/232 .612/.595 112LSA with an XE lobe on the int./ XER lobe on the exh. would give you great TQ across the graph. Pat's suggestion would be great also. Either would work great for what you have and again they're just some numbers to play with. You can use the stock L92 rockers and ship them to Harland Sharp to get rebushed for ease of mind until the aftermarket steps it up on their rockers. Je$el and Yella Terra are the only ones making them for now and there's been 0 gains shown from either.

Quote:

---

Originally Posted by freemaSSon

just some input from been there done that.....i have gone to the stroker now and kept the L92 top end

---

So...you kept the 62cc chambers which puts you at what CR? or did you use another set with larger chambers?

Quote:

---

Originally Posted by DBTBSS

So...you kept the 62cc chambers which puts you at what CR? or did you use another set with larger chambers?

---

NOPE no worky....the stock 72cc's would have been like 12 to 1

the new heads are LPE freaked and tweaked full CNC hollow stem intake on stock diameter with patriot gold extreme duals that have been CNC BOWLED to 74cc's and i am still above 11.6 to 1......

that 4.135 bore size is a killer....and that is flattop pistons with 10cc valve reliefs.....

This is what i wanna do to my lq9, l92 heads an the l76 intake. :tacos:

Quote:

---

Originally Posted by ChevyLee

This is what i wanna do to my lq9, l92 heads an the l76 intake. :tacos:

---

in a truck or a car?......

Quote:

---

Originally Posted by freemaSSon

NOPE no worky....the stock 72cc's would have been like 12 to 1

the new heads are LPE freaked and tweaked full CNC hollow stem intake on stock diameter with patriot gold extreme duals that have been CNC BOWLED to 74cc's and i am still above 11.6 to 1......

that 4.135 bore size is a killer....and that is flattop pistons with 10cc valve reliefs.....

---

Okay. You had me thinking, how in the eff did he do that:spit:. Mine are at 75cc's w/ CR at about 11.0 to 1. Might be leaving some on the table but there's room to adjust timing.

Quote:

---

Originally Posted by freemaSSon

in a truck or a car?......

---

in my truck, 98rcsb

Quote:

---

Originally Posted by ChevyLee

This is what i wanna do to my lq9, l92 heads an the l76 intake. :tacos:

---

Quote:

---

Originally Posted by freemaSSon

in a truck or a car?......

---

Uh oh, here we go. A gto is 4k lbs. and runs the car intake. A big stall and some giggle juice will make up the 20ft lbs lose of TQ.

Quote:

---

Originally Posted by DBTBSS

Okay. You had me thinking, how in the eff did he do that:spit:. Mine are at 75cc's w/ CR at about 11.0 to 1. Might be leaving some on the table but there's room to adjust timing.

---

thats the cr i am looking at 11:1 not interested in spraying or going FI, plans to stay N/A

my truck is 4200 and im not running spray.

Quote:

---

Originally Posted by skeet

thats the cr i am looking at 11:1 not interested in spraying or going FI, plans to stay N/A

---

62cc'd chambers is as low as you can go, 65cc's is safe. I haven't done the math but that would put you pretty close to 11 to 1. Stock LQ9 CR is 10.3-10.4 to 1?

Quote:

---

Originally Posted by ChevyLee

my truck is 4200 and im not running spray.

---

I think Im going to be lighter than that at race weight. No spray=chicken:LOL:. J/K to each their own.

Quote:

---

Originally Posted by DBTBSS

to each their own.

---

YEAP, including giving away TQ for no good reason.....



L92 INTAKE for L92 HEADS!!!!!!!

so the spray does all it can do.......then the "termi" will look like he's testing his ABS the next time you line up with your buddy........






hopeing to get back to the track WED to test the 4.10's that i re-installed and some tranny tuning we have done......200 shot or bust!!!!!!!!!

Quote:

---

Originally Posted by freemaSSon

YEAP, including giving away TQ for no good reason.....



L92 INTAKE for L92 HEADS!!!!!!!

so the spray does all it can do.......then the "termi" will look like he's testing his ABS the next time you line up with your buddy........






hopeing to get back to the track WED to test the 4.10's that i re-installed and some tranny tuning we have done......200 shot or bust!!!!!!!!!

---

what do you mean giving away tq? I thought those intakes helped.
i only plan on getting a 3k stall, doing those heads an intake, and getting a cam no smaller then 224/224 .581/.581 112 lsa
no spray no FI i am going for ALL motor

Quote:

---

Originally Posted by DBTBSS

I think Im going to be lighter than that at race weight. No spray=chicken:LOL:. J/K to each their own.

---

You better after all that mess your taking out and the escape jon made :coffee:
i dont want to run spray b/c i don't have a good place to mount the bottle AND i dont need a baby bottle to win a race :rofl:

:popcorn:

Quote:

---

Originally Posted by ChevyLee

what do you mean giving away tq? I thought those intakes helped.
i only plan on getting a 3k stall, doing those heads an intake, and getting a cam no smaller then 224/224 .581/.581 112 lsa
no spray no FI i am going for ALL motor

---

the truck intake creates greater torque and if you plan to stay N/A the truck intake is the only chouce and if you are serious about that cam with L92's then you are gonna be disappointed.....the heads have VERY lobsided flow, meaning the intake WAY out flows the exhaust which has to be made up by using a dual plane cam grind ie the split....a single plane cam will be a TURD with L92's

if that cam is really your choice then find a set of 243 cast CNCed heads, here's a set new in the box for sale on a TBSS board (FS: Brand New Patriot LS2/243 Stage II Heads Assembled & LPE GT2-3 Camshaft... - TBSSOWNERS.com Forums - The #1 TrailblazerSS Dedicated Owners Forum)

Quote:

---

Originally Posted by freemaSSon

the truck intake creates greater torque and if you plan to stay N/A the truck intake is the only chouce and if you are serious about that cam with L92's then you are gonna be disappointed.....the heads have VERY lobsided flow, meaning the intake WAY out flows the exhaust which has to be made up by using a dual plane cam grind ie the split....a single plane cam will be a TURD with L92's

if that cam is really your choice then find a set of 243 cast CNCed heads, here's a set new in the box for sale on a TBSS board (FS: Brand New Patriot LS2/243 Stage II Heads Assembled & LPE GT2-3 Camshaft... - TBSSOWNERS.com Forums - The #1 TrailblazerSS Dedicated Owners Forum)

---

I am serious about that cam, i am going to do more research and i don't plan on doing any of this for a year or two. thanks fer the info.

we have one of our mods on the same board with a NASTY NSATY set of 243's that just cam off his truck for even less.....he's in DFW area

My For Sale Thread... - TBSSOWNERS.com Forums - The #1 TrailblazerSS Dedicated Owners Forum

Quote:

---

Originally Posted by freemaSSon

we have one of our mods on the same board with a NASTY NSATY set of 243's that just cam off his truck for even less.....he's in DFW area

My For Sale Thread... - TBSSOWNERS.com Forums - The #1 TrailblazerSS Dedicated Owners Forum

---

well damn yeah just throw a kink in what i am wanting to do lmao!!!!

damn thats some good flow rates on those heads

GREG GOOD has it going on......243's CNCed and freaked by the man....

Quote:

---

Originally Posted by head comparison

Here are my flow numbers: For Comparison



(Stock 243 heads | 2.055/1.60 Rev Valves | Patriot Extreme Gold springs)

Flowed at 28" h2o on Superflow 600 at 4.00" Bore

LIFT .100 .200 .300 .400 .500 .550 .600

INT n/a 147 225 279 321 333 337

EXH n/a 126 171 215 237 240 244



Compared to: (from GM High Tech Magazine)

Cylinder Head Testing - GM High Tech Performance Magazine



AFR (2.02/1.60)

LIFT .100 .200 .300 .400 .500 .550 .600

INT 68.6 152.9 217.4 263.9 300.7 318.6

EXH 58.6 115.9 168.8 205.4 219.8 229.9

DART (2.02/1.60)

LIFT .100 .200 .300 .400 .500 .550 .600

INT 66.3 131.1 195.5 232.4 266.6 275.5 261.3

EXH 50 96 138 174.5 196 204.3

EDELBROCK (2.02/1.57)

LIFT .100 .200 .300 .400 .500 .550 .600

INT 64.8 141 197.9 247.4 280.4 302.9

EXH 55.9 105.5 151.9 191.3 207.2 216.8

LIVERNOIS(2.08/1.575)

LIFT .100 .200 .300 .400 .500 .550 .600

INT 66.2 149 215.5 266 305.5 325

EXH 59.5 116.7 158 195.5 215.6 225

TFS (2.04/1.575)

LIFT .100 .200 .300 .400 .500 .550 .600

INT 68.6 147.8 218.9 267 309.7 327.6

EXH 56.0 113.5 175.2 216.6 229.3 238.9



L92 HEADS: (STOCK)

Tested on 4.125 Bore

LS2 Engine L92 Cylinder Head Specs - GM High Tech Performance



LIFT .100 .200 .300 .400 .500 .550 .600

INT 79.2 153 225 276 309.6 323.2 332.2

EXH 57.8 114.4 147.2 170.3 183.1 186 189.5



Scoggin Dickey CNC L92

SD8800 Cylinder Head, L92 CNC Ported, Manley Valves, 0.650" Lift Springs



LIFT .100 .200 .300 .400 .500 .550 .600

INT 69 154 222 266 309 345

EXH 46 100 136 166 189 202

---

Quote:

---

Originally Posted by ChevyLee

I am serious about that cam, i am going to do more research and i don't plan on doing any of this for a year or two. thanks fer the info.

---

+1 You can't put that cam in with those (L92)heads. When the time comes Ricky we'll get you a cam and it won't be that one. I informed you that you lose some low end torque with the car intake over the truck intake. You prob. need the truck intake since your staying N/A 6.0L, 80e, no power adder RCSB. I might just have to do a dyno comparison between my ported L76 intake and the L92 intake, see what the difference is on my setup. Which ever is better, I'll go with but, I want to try it and see. I'm the duckling that never stayed in line. Here's the flow between the two. These are factory pieces, wait till the fast or weiand comes out. I just know the truck intake dies up top (what 4500rpms?). Pick your poison on this one.
L92/L76 Intake Manifold Flow Comparison - LS1TECH

Quote:

---

Originally Posted by DBTBSS

+1 You can't put that cam in with those (L92)heads. When the time comes Ricky we'll get you a cam and it won't be that one. I informed you that you lose some low end torque with the car intake over the truck intake. You prob. need the truck intake since your staying N/A 6.0L, 80e, no power adder RCSB. I might just have to do a dyno comparison between my ported L76 intake and the L92 intake, see what the difference is on my setup. Which ever is better, I'll go with but, I want to try it and see. I'm the duckling that never stayed in line. Here's the flow between the two. These are factory pieces, wait till the fast or weiand comes out. I just know the truck intake dies up top (what 4500rpms?). Pick your poison on this one.
L92/L76 Intake Manifold Flow Comparison - LS1TECH

---

i know it lost low end but like we said who stays below 3k at the track? LOL
Your buying me a cam Kurt? what AWESOME thanks bro! dont tase me:badteef:
oh btw you missed it at the car show, the cops were pullin ppl over who came in on slicks haha

the head and cam swap is complete!!!


l92 heads

patrick G spected cam

i used my 42# injectors with my edelbrock fuel rails, also with my 90mm cable TB

i made brackets for these, i am finishing up the final bracket today, well ok a friend at work, if i can spare his work load today ;)

wanna thank melissa for getting my tune out, wanna thank bret for doing the brackets ( fawker did them on OT) lol


Wanna Thank DBTBSS & FreemaSSon for the input thanks guys



on another Note i talked to quite a few cam Gods lol and yes the split is the only way to go, after hearing so many cam specs and all of them falling into or close to the same catagory, i talked with patrick and made a final decission..Now how this setup will preform, well i will find out soon...

No problem at all. Let us know how it runs, videos are great! If they're not top secret, I'm curious what cam specs are? I'm sure Patrick G took care of you.

Quote:

---

Originally Posted by DBTBSS

No problem at all. Let us know how it runs, videos are great! If they're not top secret, I'm curious what cam specs are? I'm sure Patrick G took care of you.

---

nothing is top secret if it will help out a fellow trucker cam specs: 232/238 .612"/.607" 112LSA +2


if all goes well should be back on the road by this weekend, i'll get picks up maybe today or tomorrow..

Quote:

---

Originally Posted by skeet

nothing is top secret if it will help out a fellow trucker cam specs: 232/238 .612"/.607" 112LSA +2


if all goes well should be back on the road by this weekend, i'll get picks up maybe today or tomorrow..

---

Wow! I wanna hear that idle video clip. With your stall and other mods... you gotta screamer on your hands! Congrats and badass man! Get some vids up if you can.

I am going to do a similar setup, 6.0L block and L92 heads, but Turboed!

Jamest

Quote:

---

Originally Posted by DBTBSS

Wow! I wanna hear that idle video clip. With your stall and other mods... you gotta screamer on your hands! Congrats and badass man! Get some vids up if you can.

---

thanks man! yeah i had the heads milled .015 to keep cr at 11:1 setup should work well, later part of next year i'll go the 408 route, then dump the drive train into a RCSB which should work even better.

Quote:

---

Originally Posted by Jamest

I am going to do a similar setup, 6.0L block and L92 heads, but Turboed!

Jamest

---

thanks gonna be awesome jamest!!

So what intake did you end up going with? I am still doing some research, and planing on l92 heads, with 90mm intake (truck one). Just wondering if its worth all of that.

Quote:

---

Originally Posted by ChevyLee

So what intake did you end up going with? I am still doing some research, and planing on l92 heads, with 90mm intake (truck one). Just wondering if its worth all of that.

---

went with the l92 truck intake with a cable TB, i will have a set of extra fuel rail brackets if you need a set, i used the edelbrock fuel rails off my vic jr intake, anyone interested in that can send me a pm with offer..


as for the throttle bracket i also had one made...

i wont know if it was worth the swap until i hit the track then get some dyno #s ..


oh yeah i had my heads ported also with dual springs, titanium locks and such with hollow valves.. and the head gaskets are .040

Cable = non computer controlled right?
If so where did you get your 90mm TB.

Quote:

---

Originally Posted by ChevyLee

Cable = non computer controlled right?
If so where did you get your 90mm TB.

---

got the 90mm awhile back from texas speed!! yes its a noncomputer controlled throttlebody..

Quote:

---

Originally Posted by skeet

got the 90mm awhile back from texas speed!! yes its a noncomputer controlled throttlebody..

---

Oh ok, I'll check em out thanks.

man this setup sounds wicked, just need to have it tuned, allens retune cant even keep it idled.it will start then i have to gas it alittle to keep it running, didnt have much time yesterday evening to do much but i was able to crank it sounded really good..this evening and tomorrow i will check everything out make sure i dont have a vacuum hose ( line ) off somewhere that would keep it from idling..


p.s. i was really impressed when it cranked, not that it wouldnt but from the sound of it cranking