99Z282NV,

I would go with a cam in the .600 lift range with a duration in the high 22X to low 23X like our 51016 cam. Getting that peak power of 500 is great for a dyno number but at the expense of mid range torque that will get you up and out.

If you want that peak HP number go with a cam like our 51015 cam, you will loose low and mid power compared to the 51016 but will have that top end power that you are looking for.

Any cam that you choose. PLEASE triple check your piston to valve clearance. Depending on how dished your pistons are and the size of the valve reliefs will dictate how much lift and duration you can go with.

Hope this helps. (My opinion is to go with the 51016 cam, it will have a much more streetable idle, you will get approx 25 ft-lbs more torque midrange then the 51015 but loose approx 20 top end HP.)

Thanks
Hank

 

Scott,

With a direct swap from an LS2 intake and Stock Heads to the SLP L92 Heads and L76 intake yeilded +32.8hp and +31.3ft-lbs at the wheels. This was with the same tune, adjusted for A/F ratio, on a full bolt on stock LS2 motor in a C6. (headers, catback, cold air, high flow cats)

A tune on a LS2 GTO typically yeilds +15-17 hp and torque at the wheels.

A very close guess on a manual LS2 GTO with long tube headers, high flow CATS, Cat-Back, L92 Heads, and tune (add a 160 thermostat, it is worth it) would be 410-415hp and similar torque at the wheels. Your peak torque with the L92 heads will be at about 4700 and your peak power at 5800 with the stock LS2 Cam.

Personally I would stay with the stock camshaft as a perfect idle with 400HP and torque at the wheels in a manual with a stock camshaft is tons of fun. If you need more get up and go when it is all said and done, do a gear swap.

Hope this helps.

Hank

 

Thanks for the quick reply Hank. I take it the numbers you quoted me were with the SLP higher ratio rockers?

Scott

 

Scott, those numbers are without the SLP 1.85 rocker arms as you can not use the 1.85 because of the offset intake valve on the L92 Heads.

You will end up with roughly 480HP at the flywheel with the L92 package and the rest of the 455 Bobcat Package minus the underdrive pulley & rockers.

Thanks
Hank

 

Got it thanks. I should have asked this yesterday, but I notice in your C6 ZL500 package, you add different pushrods. What is the reason for the different push rods?

Also, does the compression change any with the SLP L92 milled heads?

Thanks again.

Scott

 

I have a few questions for Hank (SLPPower)
I just recently bought a 1998 Camaro Z28 from a middle aged lady. It only has a K&N filter, just about as virgin as an LS1 can be. I'm looking to make it street/strip everyday driver during the warm months in Michigan. I am hoping to try and hit up around the 450 horsepower mark and 450 +/- 10 on the torque. Being a 20 year old in college, training to become an automotive technician under GM's ASEP program, I don’t exactly have tens of thousands of dollars to spend. I only have around 4-5 g's to play with. My questions to you are will the Cylinder Head and Manifold Package, SLP/L92 Cable Driven (64cc) *item#12293* work on a stock 1998 LS1 assuming I reprogram it and eliminate the EGR provisions found on the 98-99 models? Will the compression be too high for pump gas? Would I be able to run the 51014 cam shaft or would there not be enough piston to valve clearance (stock pistons)? If not, what’s the biggest cam I could run without having to cut the pistons? And lastly I want to upgrade to chrome molly push rods, could I use the stock 7.400" length or would I have to drop down to the 7.375" length?
I would appreciate any help you could give me on these questions as I have been un-able to answer them though reading links on internet. Sorry I had to flood you with so many questions.

Thanks
Brandon

 

"NOTE: SLP L92 Heads can only be used on LS motors with a 4.000" Bore or larger."



http://www.slponline.com/coming_soon_12293.asp

 

Here is a specific set of questions for you. I have an Lq9 block 6.0 L, I already have a set of l92 heads and I want to use the l72 intake (Truck setup). Do you have a drive by Cable l72 kit instead of the Drive by Wire ? Also, it is going into a 1984 corvette, so I will be changing ou the tranny among other things. Would it be easier to stick with drive by wire or to stay with drive by Cable. What Cam would you use for primarily a street car with occasional strip. Rear is 3.31:1 I beleive. Thanks

 

Good Morning Scott,

Shorter pushrods to keep the same preload on the lifters as stock because the heads are milled.

The chamber size on the SLP head is 64cc.

The stock LS2 chamber size is 65cc.

There is a small boost in compression ratio using the SLP L92 Heads on a stock bottom end LS2.

Thanks
Hank

 

Got it, thanks!!!

 

The new 2007 GM Truck/SUV setup is the L92 intake manifold. Our throttle cable bracket is only for the GM PP L76 low profile intake. It will not work on the L92 truck intake. We are working on a kit that uses the new L92 truck manifold but it will not be ready for some time. Sorry we could not help on the bracket now.

I would stay with the cable driven throttle body.

I would suggest a cam like our 51016 camshaft. That cam will do great on the street with a nice idle, great torque and mid range power with good power up top. (starting to sound like a salesmen here. )

Thanks
Hank

 

Assuming I switch out to the l76 low profile intake. This is a drive by wire. I suppoise I coul purchase the new gas pedal with the TAC moudle and use it with the stock L76 Intake. For a cable option, do you folks have a modifiaction for reaqsonable $$$. Also, has anyone dynoed out that cobination. Lq9 (364ci), l92 hEADS, l76 intake and yoiur 51016 Cam ? How much lift would that Camshaft require along with whether I COULD GET AWAY WITH STOCK z06 SPRINGS ?

Thanks

 

Man I gotta give u guys a call. Are you (at SLP) gonna put it it all together Bottom end, head and cam, intake manifold, and TB?

 

For a cable option you would use the L76 intake with a Fast 90mm throttle body and our throttle cable bracket.

http://www.slponline.com/view_product.asp?P=12509

We have not dynoed a stock LQ9 with our L92 heads and 51016 camshaft as of yet. Piston to valve clearance could also be an issue. We have not checked yet so we do not know.

You will need aftermarket springs for the 51016 camshaft. Please go to the link below for the full specs.

http://www.slponline.com/view_product.asp?P=51016

Thanks
Hank

 

Long block kits will be available April 30th. The manifold is included in the full long block kit, but NOT assembled as the long block does not come with the valley cover. (you are to use your old one)

Please see the link below for full details.

http://www.slponline.com/coming_soon_l92.asp

Thanks
Hank

 

has any one had any results from the l92 heads on a 6.0 lq4 stock yet. let me know im still waiting for my heads to arrive

 

Hello All Again,

Here is some info that many have been asking for. FLOW DATA WITH INTAKE MANIFOLDS ATTACHED.

Please see the .gif attached.

This is the flow data for a STOCK LS2 Head vs. SLP L92 Head with both the low profile and tall (truck manifolds) attached for each head. You will see 4 lines on the graph.

Here is the key to read the graph:

SLPL92TK = SLP L92 Heads with GM L92 Truck Manifold (2007)
SLPL92L76low = SLP L92 Heads with GMPP L76 Manifold (2007)
ls2stktrkman = STOCK LS2 head with Stock LS2 Truck manifold, same as found on a Trailblazer SS (2007)
ls2stkman = STOCK LS2 Head with Stock LS2 Car Manifold, same as found on a 2005-2006 C6

As you can see, both the truck and car manifolds are nearly identical. At the .600" lift mark they are only off by 3 CFM from each other.

As you can also see bolting up the new SLP L92 Heads with either manifold will yeild significant improvements in power over a stock LS2 setup. At .600" lift the SLP L92 heads increased flow by 60 CFM over the stock LS2 setup through the intake manifolds.

Check out our links for P/N 12292 and 12293 for engine and chassis dyno power numbers if you have not done so already.

If anyone would like the full report, (all numbers) please pm me your email address.


ALL TESTS WERE COMPLETED WITH THE STOCK LS2 THROTTLE BODY.

Thanks
Hank

 

This is verygood information! Thanks

Hank, Can you post pictures of SLP's CNC machined L92 combustion chamber?

 

Please see attached the SLP CNC Chamber on the L92 Head.

Thanks
Hank

 

Very nice! Thanks