Edited July 2007: It is confirmed that the LS3 shares the same cylinder head castings and block casting as the L92 truck engine. The main difference in LS3 complete heads is that they have lighter valves and better valvesprings than standard L92 complete heads.


Ok here is all the info I have so far.


L92 Part numbers

GM #12590771 2.16 intake valve
GM #12582719 1.59 exhaust valve
GM #12582714 L92 Bare Cylinder head
GM #12600936 Rocker arm pedestals
GM #12569167 Intake Rocker arm
GM #10214664 Exhaust Rocker arm
GM #12590124 L76 Style Intake manifold
GM #12499225 LS Series lifter kit(newly designed for high RPM LS7 usuage)

L92 injecter info
https://ls1tech.com/forums/generation-iv-external-engine/612758-injectors-l76-intake.html

Here are the details and photos of the L92... my only question is, when could I actually have one in my hands!

The main things everyone needs to know about the L92 engine...
6.2L
Aluminum block and heads
LS7 design heads with the offset rockers
Variable Valve Timing
Forged stock crank

L92 combustion chamber
http://gm.wieck.com/forms/gm/previewpage?026549 valves
http://gm.wieck.com/forms/gm/previewpage?026546 valveless

LS7 combustion chamber
http://gm.wieck.com/forms/gm/previewpage?022797 valves
http://gm.wieck.com/forms/gm/previewpage?024297 valveless


L92 Intake ports
http://gm.wieck.com/forms/gm/previewpage?026548 intake ports

LS7 Intake ports
http://gm.wieck.com/forms/gm/previewpage?022803 intake ports
http://gm.wieck.com/forms/gm/previewpage?022800 intake ports

LS7 Exhaust ports
http://gm.wieck.com/forms/gm/previewpage?022799 exhaust ports
http://gm.wieck.com/forms/gm/previewpage?022798 exhaust ports

Exactly, they do look to be unported LS7 heads..............

Cam phaser...
http://gm.wieck.com/forms/gm/previewpage?026547

6.2 Block pics...
http://gm.wieck.com/forms/gm/previewpage?026545
http://gm.wieck.com/forms/gm/previewpage?026551
http://gm.wieck.com/forms/gm/previewpage?026552
http://gm.wieck.com/forms/gm/previewpage?026557


http://media.gm.com/us/cadillac/en/...cifications.htm

Type:
6200 6.2L V-8 (L92)

Displacement (cu in / cc):
378 / 6199

Bore & stroke (in / mm):
4.06 x 3.62 / 103.25 x 92

Block material:
cast aluminum

Cylinder head material:
cast aluminum

Valvetrain:
OHV, 2 valves per cylinder

Ignition system:
coil near plug ignition, iridium electrode tip/ iridium core spark plugs, low-resistance spark plug wires

Fuel delivery:
sequential fuel injection

Compression ratio:
10.5:1

Horsepower (hp / kw @ rpm):
403 / 301 @ 5700*

Torque (lb-ft / Nm @ rpm):
417 / 565 @ 4400*

Recommended fuel:
premium recommended but not required

Maximum engine speed (rpm):
5900

Emissions controls:
close-coupled catalytic converter, Quick Sync 58X ignition, returnless fuel rail, fast-response O2 sensor

Estimated fuel economy:
TBD

 

THE HEAD ON THE RIGHT IS THE L92 HEAD AND THE ONE OF THE LEFT IS THE LS7

 

Richard@WCCH Did the flow testing of the new L92 heads.

I just finished flow testing a new stock L92 head. All I can says is…….WOW! What a nice part.
I’d like to publicly thank StreetnStrip for the opportunity to test this head.
The test head has casting number 5364. Here’s the tale of the tape……..

4.030” test bore
Lift ___.100 _.150_.200_.250_.300 _.350 _.400 _.450 _.500 _.550 _.600 _.650_.700_.750
#1 Int. 74.9 109.4 154.4 193.5 225.3 252.8 274.6 292.7 308.8 321.0 328.7 326.6 310.0 316.6
#1 Exh. 63.6 97.9 126.1 148.7 162.3 178.6 189.6 197.6 205.5 210.7 214.6 217.8 221.2 223.5
The intake was tested with a radius plate and the exhaust was tested with a 2 ½” stub pipe.

4.155” test bore
Lift ___.100 _.150_.200_.250_.300 _.350 _.400 _.450 _.500 _.550 _.600 _.650_.700_.750
#1 Int. 73.8 108.7 153.2 192.6 225.2 253.6 277.0 296.7 313.0 326.0 335.8 326.9 327.3 317.1
#1 Exh.61.1 97.9 125.7 148.1 162.0 179.5 191.8 200.1 205.9 213.3 218.4 220.9 221.9 223.2
The intake was tested with a radius plate and the exhaust was tested with a 2 ½” stub pipe.

Exhaust port tested without pipe (4.155” bore).
Lift ___.100 _.150_.200_.250_.300 _.350 _.400 _.450 _.500 _.550 _.600 _.650_.700_.750
#1 Exh.63.1 94.7 121.1 140.6 156.9 165.8 176.1 182.8 187.9 191.4 193.7 195.6 197.6 199.5

Valve dimensions:
Intake = 2.160” X 4.870” X .314”(8mm)
Exhaust = 1.590” X 4.920” X .314”(8mm)

Seat/throat diameters:
Intake = 1.870”
Exhaust = 1.355”

Volumes:
Intake runner = 260.6cc
Exhaust runner = 90.0cc
Chamber = 69.8cc

A few observations………. These heads have the best seat/port lineup for an as cast GM head that I’ve seen. Their casting precision is VERY good. The fit and finish of the valves are very nice as well. The intake port is large, especially the area above the short turn radius. The intake cross section starts at 3.1sq/in at the intake flange and grows to almost 3.7sq/in forward of the guide boss!
I’m a bit disappointed with the exhaust port flow. IMO it needs to be at least 25 peak cfm better. I’m sure the engineers at GM know what they’re objective was and they were satisfied with the final product but I think for hot rodding especially blown applications, the exhaust port needs to be improved. Looks like head porters will have something to do after all………
I understand that there is a company working on a 4bbl carb style intake, but I’ll leave the intake manifold subject for another thread.

Happy hot rodding.

Richard


L92 408 first results....


https://ls1tech.com/forums/dynamometer-results-comparisons/626547-l92-408-first-results.html



L76 intake flow numbers(Special thanks to Rick at WCCH for the info )
https://ls1tech.com/forums/showthrea...5&page=1&pp=10

 

Most of the info I got was from here and from my local GM garage. Im sorry if I didnt give the people who psoted up pics or part numbers the credit they deserve. Also can I get a sticky and also if anyone has more info to add please do so. i also will have rocker arms soon and I will psot of pics of them on a head.

 

Rich...you need to watch out man...I may be humping your leg very shortly.

Nate

 

Great post, Im glad someone finally made a thread with all the part numbers in it. Also are the lifters sold in sets or is that each, its like 100.00?

Do we know yet, will regular LS1 springs fit in these heads? Like a set of PRC's?? Also the vlaves, can aftermarket ones be used, and is there room to put larger valves in there? These heads are going to be amazing, pretty big chambers but flow a **** load of air.
thanks
ed

 

Great info I think you are more excited about this L92 stuff then we are.

 

+1
yea
300+cfm heads as cast for less than a g'

 

ok, I noticed there is no block number that has been put up yet.......here it is:
12584727

hope I'm not too late to the game. BTW its a good part number for the bloc, but no pricing info has been released cause GM is waiting for a vendor for the block. Any more info wanted?

 

I was told that we can only get that block in a long block is this true?

 

also need the part number for
crankshaft
connecting rods

 

ok, the block part number is for the bare block.

12584997 - crank part number - availability is somewhat limited, just a bit longer wait for it.

12577583 - con rod number - availability is no problem, almost next day.

 

Passenger car manifold part number...12590124

 

Is that for sure the intake part number, looked on GMpartsdirect.com and its less that $200.00.

is it out of quality control already thought it wasnt supposed to be cleared to be sold until may 11th, and now their listed?
just want to make sure as the description isnt specific enough for me to order already, lol

thanks
ed

 

yeah there suppose to be out next week on the 12th. I know my guy said i need to get a vin so i could get it quicker so hopeful it will be here soon. I do have an australian Vin do any of u guys need it.

 

This is a great thread! Thanks to everyone for your contributions.

Is it me, or are the heads in the above picture on opposite sides? The L92 heads should have the intake bolts holes low on the intake flange.
Trivial stuff...........

Great job here guys. Keep up the nice work.


Richard

 

these heads look to be awsome

just wish there was an intake alternative

 

Connecting rod material???

 

If i were a betting man, id say they are good ole PM, powdered metal.

 

gmpartsdirect says the con rods are 80 bucks each, seems kinda high for a factory rod, maybe they are a forged piece like the crank, which is only 174 bucks. I sure wish they would release the price for the block, im starting to think that with these prices for this engine, that im going to build a 6.2 for my Sonoma GT instead of a reg LS2.

Id be willing ot bet that even though the L92 block is aluminum the fact that its not a corvette part will make it cheaper than the grand for the LS2 block.