Help with custom Cam

OnyxSSS

OnyxSSS

Forum Member
Hey guys, I am putting together a head/cam swap for my GM LQ9 6.0L and have been looking for a cam. I contacted livernois and they can give me either a custom cam or the one they have for the same price. I dont know enuff about cams to spec it my self...does anyone have a program or want to help me pick one??

6.0L
L92 head
Upgraded springs (.600)
A4
4.11 Gears-AWD
5600lbs
DD
stall undecided but should be between 2600-3K


Here are the few off the shelf grinds: the Livernois StageII
230/236 .590/.600 114
and carcraft's LS2 cam that put up 500hp thru a carb intake(compXR281HR)
228/230 .571/.573 112

Thanks for the help/tips/advise
-joe
 
I think 10.7:1
I have read (part of the problem) that on the flat top piston of the LQ9 it gives a very slight bump in compression.
the heads are stock/unmilled
 
hmmm I think it will be lower then that. the chamber is 70cc IIRC. The factory 243 heads have a 68cc chamber. Mill the heads 0.030 get the chamber down 2ccs and your back at stock compression.

The other issue will be Piston to valve clearance. the ls2 piston is already a bit shy in that department. Adding more valve to it is risky. You would have to be willing to clay the engine with either of the camshafts you have listed and willing to flycut.

As for a custom grind I do not publish cam specs online for some of the thieves to steal. If you have something in mind drop me a line on the shop phone.
 
compression info:
317's are 70-71cc and L92's are 69-70cc. essentially the same. LQ9's have 10.5:1 stock.
 
I was thinking ls1 not lq9. I would still mill them 0.030 to bump the compression a touch. Could also run a thinner head gasket. That will help a bit to.

Still got piston to valve concerns even with the factory valve reliefes in the truck pistons if you have one of the later model shortblocks. If it is a flatop I will almost guarentee it will need flycutting. That intake valve is about .100 larger then stock. thats is going to take away 0.050 roughly of the .070-.100 or so you would have had with stock 2.00 valve and the stock pistons with either of those camshafts.

If you need help please feel free to call.

OnyxSSS said:
compression info:
317's are 70-71cc and L92's are 69-70cc. essentially the same. LQ9's have 10.5:1 stock.
Click to expand...
 
thanks Sean...I feel bad calling guys at work, I would hate to pull you away from a project...kind of like when I am working and my wife calles me to change a diaper.

I am considering running the cam that I have in there
224/224 .581/.581 112 (Doing the math is it correct that that cam has 0 overlap?)
or
Livernois Stg I
224/230 .581/.590 114


I picked up the injectors last night (42 marine) and my throttle body conversion box is in the mail.
 
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OnyxSSS said:
thanks Sean...I feel bad calling guys at work, I would hate to pull you away from a project...kind of like when I am working and my wife calles me to change a diaper.

I am considering running the cam that I have in there
224/224 .581/.581 112 (Doing the math is it correct that that cam has 0 overlap?)
or
Livernois Stg I
224/230 .581/.590 114


I picked up the injectors last night (42 marine) and my throttle body conversion box is in the mail.
Click to expand...

I was looking at that first one but on a 114+4. Should smooth it right out. The second one looks good too. They got that on the shelf?

-Geoff
 
Definitely stay away from a single pattern cam for an l92 combo, the I/E ratio is WAY too far off to effectively work with that type of cam.

And remember a .600 lift spring with a 243 head is almost instantly a .580 lift spring on an l92 valve because of the weight difference in stock valves. It has gotten to the point that we NEVER recommend anything except our dual spring on ANY l92 head with any aftermarket cam. Our stage 1 cam was specifically designed for guys running stock cube 6.0's w/ an unported L92 head.

I also think anything larger and you will not enjoy driving it anymore...
 
88ls1blazer said:
Definitely stay away from a single pattern cam for an l92 combo, the I/E ratio is WAY too far off to effectively work with that type of cam.

And remember a .600 lift spring with a 243 head is almost instantly a .580 lift spring on an l92 valve because of the weight difference in stock valves. It has gotten to the point that we NEVER recommend anything except our dual spring on ANY l92 head with any aftermarket cam. Our stage 1 cam was specifically designed for guys running stock cube 6.0's w/ an unported L92 head.

I also think anything larger and you will not enjoy driving it anymore...
Click to expand...
Thanks- I emailed Rick thru LS1tech and he was saying to use the Stage I, but I just wondered if going custom would be better because not many trucks are running these heads and more cars are.

Is this on the shelf??
 
Truck application ? little baby cam like a 224 228 114lsa 110 icl would be good in a truck. That head is really funny about overlap.

OnyxSSS said:
Thanks- I emailed Rick thru LS1tech and he was saying to use the Stage I, but I just wondered if going custom would be better because not many trucks are running these heads and more cars are.

Is this on the shelf??
Click to expand...
 
these heads are drving me nuts, so little info and I dont want a dyno queen. I like to drive it.

I made a chart on my kids chalk board outside today with all the specs and calculated the overlap of all the cams I am looking at :)

my goal is low 13's but I have to get a new torque converter bc my current one is stalling @ 1300 when it is rated @ 2600 :(
I am not looking forward to pulling the trans, but I lost so much time in my 60's I know it is hurting me.
 
Look into motorcycle cam specs and how they select cam timming. It will help to shed light onto what your trying to do.

Sean

OnyxSSS said:
these heads are drving me nuts, so little info and I dont want a dyno queen. I like to drive it.

I made a chart on my kids chalk board outside today with all the specs and calculated the overlap of all the cams I am looking at :)

my goal is low 13's but I have to get a new torque converter bc my current one is stalling @ 1300 when it is rated @ 2600 :(
I am not looking forward to pulling the trans, but I lost so much time in my 60's I know it is hurting me.
Click to expand...
 
Twice I considered going with the L92's, but at the end of the day I really wasn't up for going into uncharted territory. There isn't much public info and I think that there is a lot that isn't known about those heads yet. That intake valve is gigantic.

That being said, good luck on your setup Onyx. :)
 
There is plenty known about the heads. You just can't spec the camshaft like dave vizard would.


GeosRide said:
Twice I considered going with the L92's, but at the end of the day I really wasn't up for going into uncharted territory. There isn't much public info and I think that there is a lot that isn't known about those heads yet. That intake valve is gigantic.

That being said, good luck on your setup Onyx. :)
Click to expand...
 
GeosRide said:
Twice I considered going with the L92's, but at the end of the day I really wasn't up for going into uncharted territory. There isn't much public info and I think that there is a lot that isn't known about those heads yet. That intake valve is gigantic.

That being said, good luck on your setup Onyx. :)
Click to expand...

I always read about guys wanting bigger and when someone says go small they are still thinking bigger=better
then I started looking at cams and I was doing the same thing saying "no thats too small..."

Now I am thinking about a 2 pc timing cover if I have to swap the first one out and re-cam :seizure:
 
The most powereful L92 combo that has rolled on our dyno has had the smallest cam out of all of them... Trust me, run the stage 1. You are over thinking it by far, our stage 1 was designed EXACTLY for this purpose.
 
I'm considering putting some heads on my camaro if I can find some cheap. Was looking in to those l92s, but it seems like for a stock cube motor the 243 based heads would be better? What do you guys think?
 
88ls1blazer said:
The most powereful L92 combo that has rolled on our dyno has had the smallest cam out of all of them... Trust me, run the stage 1. You are over thinking it by far, our stage 1 was designed EXACTLY for this purpose.
Click to expand...

Andy- Was this a stroker motor or stock cube? Can you give any other details?
 
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