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Old June 26th, 2014, 07:19 PM   #1
Bo's Cj 7
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Default Thinking about putting 6.2 LS in Cj

I have a glass Cj 7 Amc 360 400 turbo dana 20. I am thinking I want more power I have parts to do a 401 build but a Ls 6.2 would be considerably lighter and probally make more power. I have done a little research it appears the truck motor are more desirable due to oil pan clearance. Tahoe and Escalade have had the 6.2 since 2007 or so. I am not sure if all motor are the all aluminum version. Anybody know of a salvage yard to purchase a motor ready to install and or a price for something like this. MSD makes a ignition box to run coils and I think and accel ECU would fire injector. Would need a motor or cam without VVT (variable valve timing). Any input would be great

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Old June 27th, 2014, 08:02 AM   #2
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All 6.2s are aluminum. Do you want fuel injection of a carb? Both work well with those motors. VVT and AFM can both be eliminated, its common to do when swapping.

You'll find that 6.2s are a premium cost in any salvage yard. I've seen them charging more than what you can buy them new from GM for. The crate motor versions are reasonable cost, for what they are.

Cost wise, a iron block LQ9 with better heads (either ported 243s, aftermarket cathedrals, or LS3 style square ports) will make a lot of power, for likely less money than a LS3 will cost.

I tried to find an LS3, couldn't get one for anything reasonable. I've ended up with an LS2, so same light weight (435 lbs fully dressed engine), and I have my 243 heads ported by AI, so it should be ahead of an LS3, and has better low end performance with the smaller runners. Tossing in a big cam and long tubes, LS7 MAF, efans, etc...should be good for ~525ish HP
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Old June 27th, 2014, 08:22 AM   #3
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I was in the same boat if this helps......

I ended up with a 6.0 LQ4/th350. it now has headers, cam, Texas Speed heads, tune and should be in the 450+hp range.

not sure what the 6.2 cost so I can't help there.

like Jesus mentioned, the LQ9 is an even better start since it has higher compression than the LQ4. so cam/headers/tune will net you even more hp (probably about 40-50 more to start)

my lq4 stock is around 9.4:1 and with the heads should now be in the 10.7:1 range.
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Old June 27th, 2014, 09:41 AM   #4
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Basically, an LQ9 is an iron block LS2 with different heads. Taking an LQ9 and adding the 243 heads makes it an Iron LS2 with 11:1 comp. The rotating assemblies are the same (maybe something wa different in the early ones).

The other engine not noted, but also worthwhile to look at, are the L76 or similar 6.0 Gen IV motors. They are rectangular port heads, vs cathedrals. (Although there is a lot of debate about which is best)


What is the purpose of the Jeep? How much power do you need to be satisfied? That also will play a bit of a factor in how you select and build the engine.

For a 'standard' Jeep application, finding a used iron 6.0 (LQ4 or LQ9) is usually the best cost/power option. If you are wanting to make big power for something like a sand Jeep, then I'd go Aluminum block for weight, do cam and heads, fabricate some long tubes (none exist that I've seen that will fit a CJ frame), and toss on a shot of NOS...
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Old June 27th, 2014, 11:15 AM   #5
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Thanks so far guys this is the info I was looking for, I was only thinking the aluminum 6.2 because if you start with more inches and less weight than its easier to make more power, but cost is always a factor. I am not apposed to run a 6.0 either just want best bang for the buck. I have owned and been building jeeps for about 30 years (must be getting old) had everything from a 258 street trail to 800 HP mud drag unit. I live a mile or two from trails which is great. I can build and fabricate or have friends to help. I have 300ish HP AMC 360 now and had planned a 401 build which would be toward 500HP. Jeep is strictly a toy for trail street or mostly just bragging about around the camp fire. I have preferred running the AMC because most people don't think they run or are just tractor motor. But it might be time to advance to more late model engines.
I believe MSD sells a box to fire the coils and I also talked to a friend that has a few accel fuel injection kits and said that they would run the injectors. I have a 400 turbo amc the case could be changed to chevy but am concerned about the dana 20. I could trade this to a freind for a 350 205 combo. Making headers is not a problem either. Jeep is Glass Cj-7 scout dana 44s 4 link coil spring front 100 wheelbase.
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Old June 27th, 2014, 11:24 AM   #6
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There's a dark green CJ7 that's been around the dunes for a while now. Few years back I was talking to him at the track, and he was running a stock 6.0 and a 200HP plate kit. Jeep runs pretty good, and when I had talked to him, it seemed like it was pretty reliable. Seems like he has a ton of fun with it.
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Old June 27th, 2014, 11:33 AM   #7
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I don't want to run NOS if I can get 500Hp on pump gas life would be great. I only race when standing at camp fire with cold beer and friends. (like bench racing)
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Old June 29th, 2014, 03:47 PM   #8
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Just bought a HP book Building The Chevy LS Engine. Any other reference books full of info? Someone could suggest.
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Old June 30th, 2014, 02:35 PM   #9
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LS1tech is a great forum for good info.

I just have an iron block 5.3. Coming from a 360 with a cam and simple mods, it's allot more power. Bought a NOS system a couple years ago, still wanting to put that on to get the cheap horsepower going. The only time I feel I could really use more power is in sand drags.
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Old July 4th, 2014, 08:21 AM   #10
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Do the Lq 4 and Lq 9 have the same pistons and different head combustion chambers, or are the dish vs flat top pistons? To change compression
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Old July 4th, 2014, 08:37 AM   #11
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dish vs flat. LQ9 is the higher comp of the 2
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