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LS3 & L92 Info 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 https://ls1tech.com/forums/images/st...er_offline.gif https://ls1tech.com/forums/images/buttons/report.gif 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 |
http://filelibrary.myaasite.com/Cont...4/12936645.jpg 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 ˝” 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 ˝” 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……… :jest: :jest: 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. :hump: 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 shit load of air. thanks ed |
Great info I think you are more excited about this L92 stuff then we are. |
Originally Posted by Mizfit MotorSports Great info I think you are more excited about this L92 stuff then we are. yea 300+cfm heads as cast for less than a g' :eek2: |
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? |
Originally Posted by bigredexpress99 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? |
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 |
Originally Posted by 69firebird 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 |
Originally Posted by StreetnStrip http://filelibrary.myaasite.com/Cont...4/12936645.jpg THE HEAD ON THE RIGHT IS THE L92 HEAD AND THE ONE OF THE LEFT IS THE LS7 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. :cheers: :cheers: Richard :) |
these heads look to be awsome just wish there was an intake alternative |
Originally Posted by bigredexpress99 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. |
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. |
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