Cam for L92 Heads: Lessons Learned
http://www.compcams.com/Company/CC/c...csid=1415&sb=0
Or this one..
http://www.compcams.com/Company/CC/c...csid=1416&sb=0
Launching!
Joined: Jun 2010
Posts: 255
Likes: 1
From: Alberta, Canada
What advance?? This is a great thread. Not one sided at all, but rather opinions and cams from every end of the spectrum. The bad news is I spec'd and ordered a cam for my setup before stumbling across this thread, the good news is I don't think I would change anything.
here are my specs:
224/236 duration at .050
.581/.578 lift with 1.7 rockers
XER/XE Hi-lift Lobes
113 lsa/109 icl
The engine in question:
364ci LQ9, 10.5:1 comp, untouched l92(821) heads with comp 918's, l92 truck intake.
The vehicle in question:
2006 silverado ecsb, 4l65, 4.10 gear, 2800 PI stall, daily driven.
I have seen people suggest on a few threads to delay the intake VE's as a means of controlling reversion. Get a bit of "suck" before the valve opens. After reading this thread, I kinda see that as a bunch of bull. There are alot of guys on this thread who have got great numbers with plenty of advance.
This brings me to my next question: Where would you install the icl of this cam? I'm kinda leaning towards "straight up" at +4. (109)
Opinions would greatly appreciated.
Ps. Please don't try to sway me on the cam specs, as I already have the cam. I realize the lift is a bit soft, this is because I want my valvesprings to last awhile. I realize the split is a bit much. I am hoping to eventually get the $$$$ together for a TVS2300.
here are my specs:
224/236 duration at .050
.581/.578 lift with 1.7 rockers
XER/XE Hi-lift Lobes
113 lsa/109 icl
The engine in question:
364ci LQ9, 10.5:1 comp, untouched l92(821) heads with comp 918's, l92 truck intake.
The vehicle in question:
2006 silverado ecsb, 4l65, 4.10 gear, 2800 PI stall, daily driven.
I have seen people suggest on a few threads to delay the intake VE's as a means of controlling reversion. Get a bit of "suck" before the valve opens. After reading this thread, I kinda see that as a bunch of bull. There are alot of guys on this thread who have got great numbers with plenty of advance.
This brings me to my next question: Where would you install the icl of this cam? I'm kinda leaning towards "straight up" at +4. (109)
Opinions would greatly appreciated.
Ps. Please don't try to sway me on the cam specs, as I already have the cam. I realize the lift is a bit soft, this is because I want my valvesprings to last awhile. I realize the split is a bit much. I am hoping to eventually get the $$$$ together for a TVS2300.
^^^I pretty sure that cam will do well....A bigger stall might compliment it better though...I would install the cam "straight-up"at +4 no need to advance or retard it at all....I also don't think the split is a bit much either...For instance mine is a 227/239 .614/.624 115+3 and it does just fine....(stock LS3 heads)
Launching!
Joined: Jun 2010
Posts: 255
Likes: 1
From: Alberta, Canada
Yeah, the reason I went with this stall is for the blower down the road. Guys on here say anything over 2800 can be pretty bad for traction when using the Maggie. Brings me to my next question. Would you change the orientation for FI? I cant find any info on this.
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So what cam is suggested for an LS2 from a Trailblazer SS, but ls3 heads & intake, Trailblazer throttle body, 1.75" full length headers, Trailblazer PCM (E76?), would like a little lope at idle, but don't want to deal with it driving. Tranny will be a T56 Magnum, 3.42:1 rear, in an 86 Monte SS.
Thanks
Thanks
On The Tree
Joined: Dec 2010
Posts: 169
Likes: 1
So what cam is suggested for an LS2 from a Trailblazer SS, but ls3 heads & intake, Trailblazer throttle body, 1.75" full length headers, Trailblazer PCM (E76?), would like a little lope at idle, but don't want to deal with it driving. Tranny will be a T56 Magnum, 3.42:1 rear, in an 86 Monte SS.
Thanks
Thanks
Even better, get a custom cam from Patrick G spec'd to your setup to get THE BEST results.
On The Tree
Joined: Dec 2010
Posts: 169
Likes: 1
This is a great thread. Not one sided at all, but rather opinions and cams from every end of the spectrum. The bad news is I spec'd and ordered a cam for my setup before stumbling across this thread, the good news is I don't think I would change anything.
here are my specs:
224/236 duration at .050
.581/.578 lift with 1.7 rockers
XER/XE Hi-lift Lobes
113 lsa/109 icl
The engine in question:
364ci LQ9, 10.5:1 comp, untouched l92(821) heads with comp 918's, l92 truck intake.
The vehicle in question:
2006 silverado ecsb, 4l65, 4.10 gear, 2800 PI stall, daily driven.
I have seen people suggest on a few threads to delay the intake VE's as a means of controlling reversion. Get a bit of "suck" before the valve opens. After reading this thread, I kinda see that as a bunch of bull. There are alot of guys on this thread who have got great numbers with plenty of advance.
This brings me to my next question: Where would you install the icl of this cam? I'm kinda leaning towards "straight up" at +4. (109)
Opinions would greatly appreciated.
Ps. Please don't try to sway me on the cam specs, as I already have the cam. I realize the lift is a bit soft, this is because I want my valvesprings to last awhile. I realize the split is a bit much. I am hoping to eventually get the $$$$ together for a TVS2300.
here are my specs:
224/236 duration at .050
.581/.578 lift with 1.7 rockers
XER/XE Hi-lift Lobes
113 lsa/109 icl
The engine in question:
364ci LQ9, 10.5:1 comp, untouched l92(821) heads with comp 918's, l92 truck intake.
The vehicle in question:
2006 silverado ecsb, 4l65, 4.10 gear, 2800 PI stall, daily driven.
I have seen people suggest on a few threads to delay the intake VE's as a means of controlling reversion. Get a bit of "suck" before the valve opens. After reading this thread, I kinda see that as a bunch of bull. There are alot of guys on this thread who have got great numbers with plenty of advance.
This brings me to my next question: Where would you install the icl of this cam? I'm kinda leaning towards "straight up" at +4. (109)
Opinions would greatly appreciated.
Ps. Please don't try to sway me on the cam specs, as I already have the cam. I realize the lift is a bit soft, this is because I want my valvesprings to last awhile. I realize the split is a bit much. I am hoping to eventually get the $$$$ together for a TVS2300.
http://www.livernoismotorsports.com/...t.phtml?p=1568
They have some very nice cams and I'm thinking if getting one of those two cams for my LQ4 short block with L92 heads.
http://www.livernoismotorsports.com/...t.phtml?p=1943
http://www.livernoismotorsports.com/...t.phtml?p=1939
And yes, I think the 4 degrees of advance will help improving your dynamic compression.
Last edited by Samer; May 24, 2011 at 04:41 AM.
Isn't the LQ9 a truck 6.0L? The heads flow NOTHING like the LS3/L92 heads so a cam for that would be totally different than one for an LS3/L92.
On The Tree
Joined: Dec 2010
Posts: 169
Likes: 1
So this cam didn't work very good for your motor? I am looking at one similar for an LS2 with LS3 heads & intake. Duration is about 5 deg less on both, but lift is about .015" more lift.
that cam would work decent N/A, but he is running a turbo, they like shorter exhaust duration to keep velocity high ahead of the turbine
Teching In
Joined: Sep 2010
Posts: 16
Likes: 0
Alright, a lot of this stuff is over my head. I need a cam for my stock lq4 shortblock with l92 heads and an ls3 intake thats going in my '80 Firebird. Right now I'll be running a turbo 400, with plans for a t56 in the future, funds permitting. I like the muscle car sound that that stage 2c that Samer linked. Would that be a good fit? I don't want to have to rev too high on my stock bottom end. And what kind of stall would I need?
On The Tree
Joined: Dec 2010
Posts: 169
Likes: 1
Alright, a lot of this stuff is over my head. I need a cam for my stock lq4 shortblock with l92 heads and an ls3 intake thats going in my '80 Firebird. Right now I'll be running a turbo 400, with plans for a t56 in the future, funds permitting. I like the muscle car sound that that stage 2c that Samer linked. Would that be a good fit? I don't want to have to rev too high on my stock bottom end. And what kind of stall would I need?
With the ~69cc LS3/L92 heads, your static compression ratio will be 9.7:1
I would recommend milling your heads to 65cc (0.020) and having a thinner head gasket 0.041 to pump your static compression to ~ 10.5:1 and this will also improve your dynamic compression but you will have to check PTV (piston to valve) clearance with your chosen cam.
I would recommend Livernois stage 1B cam over the 1C for your setup:
http://www.livernoismotorsports.com/...t.phtml?p=1568
The tighter LSA on the 1B (115 for 1B vs 117 for the 1C) will improve your dynamic compression. Moreover, I have noticed that people who achieved GREAT results with LS3/L92 heads are not using cams with high lift. .580 to .610 max is what's working better. I have also noticed that the best LSA for those heads is 114 and the closer you get to it, the better results you achieve (113 and 115 LSA's have achieved good results as well).