L92 Stroker new build
Thread Starter
Staging Lane
Joined: Feb 2020
Posts: 60
Likes: 12
L92 Stroker new build Getting ready to rebuild my Yukon Denali L92. Looking for some input and thoughts as to the successfulness and performance over time of my setup.
Build specs:
CPR racing engines to do all balancing and machine work
L92 Block
Bore to 4.070”
Callies compstar 8 counterweight 4.000” stroke crankshaft
Callies compstar h-beam 6.125” forged rods
SRP Pro 4032 forged 4.070” flat top -5cc pistons
Clevite rod and main bearings
Cut deck to 9.225" and use gm mls ls9 .054" head gasket ( theoretically piston out of hole .015” and quench .039)
L92 heads ported, polished and decked .020” to yield 69cc chamber
ls3 valves with psi beehive springs and titanium retainers
Trunnion bushing upgrade with 1.7 rocker arms
comp cams 222/224 .566”/.568” 112 lsa
L92 truck intake ported
afe truck intake
TSP 1-7/8” long tube headers, no cats, no muffler
ARP studs and bolts
11.42:1 compression ratio
daily driver running 93 pump gas
If all goes as planned, should be a helluva fun end result. Open to all comments, advice and critiques.
Build specs:
CPR racing engines to do all balancing and machine work
L92 Block
Bore to 4.070”
Callies compstar 8 counterweight 4.000” stroke crankshaft
Callies compstar h-beam 6.125” forged rods
SRP Pro 4032 forged 4.070” flat top -5cc pistons
Clevite rod and main bearings
Cut deck to 9.225" and use gm mls ls9 .054" head gasket ( theoretically piston out of hole .015” and quench .039)
L92 heads ported, polished and decked .020” to yield 69cc chamber
ls3 valves with psi beehive springs and titanium retainers
Trunnion bushing upgrade with 1.7 rocker arms
comp cams 222/224 .566”/.568” 112 lsa
L92 truck intake ported
afe truck intake
TSP 1-7/8” long tube headers, no cats, no muffler
ARP studs and bolts
11.42:1 compression ratio
daily driver running 93 pump gas
If all goes as planned, should be a helluva fun end result. Open to all comments, advice and critiques.
TECH Senior Member
Joined: Jul 2009
Posts: 8,034
Likes: 663
I’d preassemble the short block prior to decking to make sure you will get the correct out of hole measurements. Also I’d stick to CHE rocker arm trunnions. They are the only ones I haven’t heard ANY bad results from
On The Tree
Joined: Mar 2015
Posts: 154
Likes: 12
Getting ready to rebuild my Yukon Denali L92. Looking for some input and thoughts as to the successfulness and performance over time of my setup.
Build specs:
CPR racing engines to do all balancing and machine work
L92 Block
Bore to 4.070”
Callies compstar 8 counterweight 4.000” stroke crankshaft
Callies compstar h-beam 6.125” forged rods
SRP Pro 4032 forged 4.070” flat top -5cc pistons
Clevite rod and main bearings
Cut deck to 9.225" and use gm mls ls9 .054" head gasket ( theoretically piston out of hole .015” and quench .039)
L92 heads ported, polished and decked .020” to yield 69cc chamber
ls3 valves with psi beehive springs and titanium retainers
Trunnion bushing upgrade with 1.7 rocker arms
comp cams 222/224 .566”/.568” 112 lsa
L92 truck intake ported
afe truck intake
TSP 1-7/8” long tube headers, no cats, no muffler
ARP studs and bolts
11.42:1 compression ratio
daily driver running 93 pump gas
If all goes as planned, should be a helluva fun end result. Open to all comments, advice and critiques.
Build specs:
CPR racing engines to do all balancing and machine work
L92 Block
Bore to 4.070”
Callies compstar 8 counterweight 4.000” stroke crankshaft
Callies compstar h-beam 6.125” forged rods
SRP Pro 4032 forged 4.070” flat top -5cc pistons
Clevite rod and main bearings
Cut deck to 9.225" and use gm mls ls9 .054" head gasket ( theoretically piston out of hole .015” and quench .039)
L92 heads ported, polished and decked .020” to yield 69cc chamber
ls3 valves with psi beehive springs and titanium retainers
Trunnion bushing upgrade with 1.7 rocker arms
comp cams 222/224 .566”/.568” 112 lsa
L92 truck intake ported
afe truck intake
TSP 1-7/8” long tube headers, no cats, no muffler
ARP studs and bolts
11.42:1 compression ratio
daily driver running 93 pump gas
If all goes as planned, should be a helluva fun end result. Open to all comments, advice and critiques.
Originally Posted by Know It All
Looks like a pretty well thought out combo to me. Should be a great engine for a heavy vehicle like a Denali.
TECH Fanatic
Joined: Aug 2009
Posts: 1,845
Likes: 255
From: Coast of San Mateo County Between Pacifica & HMB
My thought for a Daily Driver below 7000 RPM the SS Retainer will provide more long term durability then Ti retainers which provides no benefit in your application imo.
Also I would talk with Cam Motion about you're Cam Specs the
exhaust Duration looks a little short for Heads & stroke but I'm no Cam expert.
My .02
Good Luck sounds like a cool build.
Also I would talk with Cam Motion about you're Cam Specs the
exhaust Duration looks a little short for Heads & stroke but I'm no Cam expert.
My .02
Good Luck sounds like a cool build.
Last edited by NAVYBLUE210; Feb 14, 2020 at 01:52 PM.
Thread Starter
Staging Lane
Joined: Feb 2020
Posts: 60
Likes: 12
I would assume that since CPR is a reputable shop, they would do a 4 corner check to make sure we get the proper out of hole measurement. I know in a perfect world my piston height at top dead center is 9.240”, and assuming the block came from the factory at a true 9.240” taking 15 thou off should get me exactly where I want to be. Obviously going to measure everything during assembly to ensure proper dimensions. For trunnions I’m going with the smith bros setup because I got a remarkable deal on them. Worst case I can swap them if I don’t like them.
Thread Starter
Staging Lane
Joined: Feb 2020
Posts: 60
Likes: 12
My thought for a Daily Driver below 7000 RPM the SS Retainer will provide more long term durability then Ti retainers which provides no benefit in your application imo.
Also I would talk with Cam Motion about you're Cam Specs the
exhaust Duration looks a little short for Heads & stroke but I'm no Cam expert.
My .02
Good Luck sounds like a cool build.
Also I would talk with Cam Motion about you're Cam Specs the
exhaust Duration looks a little short for Heads & stroke but I'm no Cam expert.
My .02
Good Luck sounds like a cool build.
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Thread Starter
Staging Lane
Joined: Feb 2020
Posts: 60
Likes: 12
My thought for a Daily Driver below 7000 RPM the SS Retainer will provide more long term durability then Ti retainers which provides no benefit in your application imo.
Also I would talk with Cam Motion about you're Cam Specs the
exhaust Duration looks a little short for Heads & stroke but I'm no Cam expert.
My .02
Good Luck sounds like a cool build.
Also I would talk with Cam Motion about you're Cam Specs the
exhaust Duration looks a little short for Heads & stroke but I'm no Cam expert.
My .02
Good Luck sounds like a cool build.
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Go new. They are cheap. No sense trying to save a few bucks there.
Thread Starter
Staging Lane
Joined: Feb 2020
Posts: 60
Likes: 12
Update!!! After doing some more research and playing around with some numbers I will be moving to a slightly more aggressive cam.
new cam specs:
Comp cams
219°/235°
0.607”/0.621”
113 lsa
Since the old cam was leaving a ton of power on the table. The only question now is do I stick with a beehive or do I go dual rate?
new cam specs:
Comp cams
219°/235°
0.607”/0.621”
113 lsa
Since the old cam was leaving a ton of power on the table. The only question now is do I stick with a beehive or do I go dual rate?
TECH Fanatic
Joined: Aug 2009
Posts: 1,845
Likes: 255
From: Coast of San Mateo County Between Pacifica & HMB
The Cam Motion LS3 Titan 2 222/230 113+3 would be a much better cam for you imo.
More intake duration to help fill your stroke, and 5 fewer exhaust degrees not wasting low end torque.
+15* exhaust split not needed, even WASTED on a low end torque application (hp peak under 6500, even 6000 rpm
with a factory ported intake on a 4.0" stroke) NA daily driver.
Cam Motion would be happy to tweak it even more for your application.
You went from a +2 exhaust split to a +15, one extreme to the other for your specific application and goals imo.
I like a quality beehive with SS retainers under .630" lift and under 7000 rpm (depending on valve weight)
My .02
Good Luck
More intake duration to help fill your stroke, and 5 fewer exhaust degrees not wasting low end torque.
+15* exhaust split not needed, even WASTED on a low end torque application (hp peak under 6500, even 6000 rpm
with a factory ported intake on a 4.0" stroke) NA daily driver.
Cam Motion would be happy to tweak it even more for your application.
You went from a +2 exhaust split to a +15, one extreme to the other for your specific application and goals imo.
I like a quality beehive with SS retainers under .630" lift and under 7000 rpm (depending on valve weight)
My .02
Good Luck
Thread Starter
Staging Lane
Joined: Feb 2020
Posts: 60
Likes: 12
The Cam Motion LS3 Titan 2 222/230 113+3 would be a much better cam for you imo.
More intake duration to help fill your stroke, and 5 fewer exhaust degrees not wasting low end torque.
+15* exhaust split not needed, even WASTED on a low end torque application (hp peak under 6500, even 6000 rpm
with a factory ported intake on a 4.0" stroke) NA daily driver.
Cam Motion would be happy to tweak it even more for your application.
You went from a +2 exhaust split to a +15, one extreme to the other for your specific application and goals imo.
I like a quality beehive with SS retainers under .630" lift and under 7000 rpm (depending on valve weight)
My .02
Good Luck
More intake duration to help fill your stroke, and 5 fewer exhaust degrees not wasting low end torque.
+15* exhaust split not needed, even WASTED on a low end torque application (hp peak under 6500, even 6000 rpm
with a factory ported intake on a 4.0" stroke) NA daily driver.
Cam Motion would be happy to tweak it even more for your application.
You went from a +2 exhaust split to a +15, one extreme to the other for your specific application and goals imo.
I like a quality beehive with SS retainers under .630" lift and under 7000 rpm (depending on valve weight)
My .02
Good Luck
TECH Fanatic
Joined: Aug 2009
Posts: 1,845
Likes: 255
From: Coast of San Mateo County Between Pacifica & HMB
I like it a lot, however it may be a touch too big for a daily driver this is were an honest
converstion with Cam Motion is called for. I am not qualified to specify to the exact
goal just hopefully point you in the right direction and help you clarify your
goals and compromises you are willing to make.
Maybe splitting the difference ~~225/234. 114+3. ??
Definitely worth a call to Cam Motion.
converstion with Cam Motion is called for. I am not qualified to specify to the exact
goal just hopefully point you in the right direction and help you clarify your
goals and compromises you are willing to make.
Maybe splitting the difference ~~225/234. 114+3. ??
Definitely worth a call to Cam Motion.
Thread Starter
Staging Lane
Joined: Feb 2020
Posts: 60
Likes: 12
I like it a lot, however it may be a touch too big for a daily driver this is were an honest
converstion with Cam Motion is called for. I am not qualified to specify to the exact
goal just hopefully point you in the right direction and help you clarify your
goals and compromises you are willing to make.
Maybe splitting the difference ~~225/234. 114+3. ??
Definitely worth a call to Cam Motion.
converstion with Cam Motion is called for. I am not qualified to specify to the exact
goal just hopefully point you in the right direction and help you clarify your
goals and compromises you are willing to make.
Maybe splitting the difference ~~225/234. 114+3. ??
Definitely worth a call to Cam Motion.
TECH Addict
Joined: Sep 2010
Posts: 2,898
Likes: 467
The Cam Motion LS3 Titan 2 222/230 113+3 would be a much better cam for you imo.
More intake duration to help fill your stroke, and 5 fewer exhaust degrees not wasting low end torque.
+15* exhaust split not needed, even WASTED on a low end torque application (hp peak under 6500, even 6000 rpm
with a factory ported intake on a 4.0" stroke) NA daily driver.
Cam Motion would be happy to tweak it even more for your application.
You went from a +2 exhaust split to a +15, one extreme to the other for your specific application and goals imo.
I like a quality beehive with SS retainers under .630" lift and under 7000 rpm (depending on valve weight)
My .02
Good Luck
More intake duration to help fill your stroke, and 5 fewer exhaust degrees not wasting low end torque.
+15* exhaust split not needed, even WASTED on a low end torque application (hp peak under 6500, even 6000 rpm
with a factory ported intake on a 4.0" stroke) NA daily driver.
Cam Motion would be happy to tweak it even more for your application.
You went from a +2 exhaust split to a +15, one extreme to the other for your specific application and goals imo.
I like a quality beehive with SS retainers under .630" lift and under 7000 rpm (depending on valve weight)
My .02
Good Luck
The Cam Motion LS3 Titan 2 222/230 113+3 would be a much better cam for you imo.
More intake duration to help fill your stroke, and 5 fewer exhaust degrees not wasting low end torque.
+15* exhaust split not needed, even WASTED on a low end torque application (hp peak under 6500, even 6000 rpm
with a factory ported intake on a 4.0" stroke) NA daily driver.
Cam Motion would be happy to tweak it even more for your application.
You went from a +2 exhaust split to a +15, one extreme to the other for your specific application and goals imo.
I like a quality beehive with SS retainers under .630" lift and under 7000 rpm (depending on valve weight)
My .02
Good Luck
More intake duration to help fill your stroke, and 5 fewer exhaust degrees not wasting low end torque.
+15* exhaust split not needed, even WASTED on a low end torque application (hp peak under 6500, even 6000 rpm
with a factory ported intake on a 4.0" stroke) NA daily driver.
Cam Motion would be happy to tweak it even more for your application.
You went from a +2 exhaust split to a +15, one extreme to the other for your specific application and goals imo.
I like a quality beehive with SS retainers under .630" lift and under 7000 rpm (depending on valve weight)
My .02
Good Luck
x3 this is a great cam imo
Thread Starter
Staging Lane
Joined: Feb 2020
Posts: 60
Likes: 12
So I did some calling today, cam motion actually suggested a custom grind over the titans. Also spoke with lingenfelter and livernois. Here are the cams on the table:
Cam Motion - 216/228 .586"/.578" 114+4 (currently my last place choice)
Livernois - 224/236 .620"/.620" 117 (third place)
Comp Cams - 219/235 .607"/.621" 113+4 (tied for first)
Lingenfelter - 215/231 .631"/.644" 118 (tied for first)
Cam Motion - 216/228 .586"/.578" 114+4 (currently my last place choice)
Livernois - 224/236 .620"/.620" 117 (third place)
Comp Cams - 219/235 .607"/.621" 113+4 (tied for first)
Lingenfelter - 215/231 .631"/.644" 118 (tied for first)
TECH Fanatic
Joined: Aug 2009
Posts: 1,845
Likes: 255
From: Coast of San Mateo County Between Pacifica & HMB
The challenge here is the relatively high static compression 11.4:1 and the heavy 5500 lb vehicle and preventing detonation.
I will give my last thoughts and defer to someone much more qualified than I going forward Jake AKA DarthV8r.
The Lingenfelter would be my LAST choice because of the lobe intensity/acceleration (shortest duration and highest lifts)
which is not a good combination in a daily driver due to the increased stress on valve springs specifically.
Cam Motion is known for their smooth and quiet lobe profiles and will custom grind what ever specs you would like
check out their lobe profiles and you can see what lifts are available in specific duration windows.
If it was me. I would split the difference between Cam Motion & Livornois @~ 220/232 ~114+3 .595"/.578"
The extra lift over .600" in your application is not worth the loss of longevity vs a small performance gain.
Notice I did not say what you should do just more food for thought.
Hopefully Darth & Chevelle (the real experts) will chime in here as well.
Just my .02
Good Luck & out.
I will give my last thoughts and defer to someone much more qualified than I going forward Jake AKA DarthV8r.
The Lingenfelter would be my LAST choice because of the lobe intensity/acceleration (shortest duration and highest lifts)
which is not a good combination in a daily driver due to the increased stress on valve springs specifically.
Cam Motion is known for their smooth and quiet lobe profiles and will custom grind what ever specs you would like
check out their lobe profiles and you can see what lifts are available in specific duration windows.
If it was me. I would split the difference between Cam Motion & Livornois @~ 220/232 ~114+3 .595"/.578"
The extra lift over .600" in your application is not worth the loss of longevity vs a small performance gain.
Notice I did not say what you should do just more food for thought.
Hopefully Darth & Chevelle (the real experts) will chime in here as well.
Just my .02
Good Luck & out.
Thread Starter
Staging Lane
Joined: Feb 2020
Posts: 60
Likes: 12
Definitely a lot of food for thought. I forgot to mention that I'm at elevation 5500' in colorado. Not saying I'm not considering the cam motion, but they seem to be the odd man out, with the other three having a larger exhaust lift over intake. If i wasn't 6K deep, I'd say f*** it and get all 4 to see which I liked best haha.