'07 LMG 5.3 truck motor: How much power is it going to make?
09-30-2008, 08:10 PM
#1
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'07 LMG 5.3 truck motor: How much power is it going to make? I just bought an 5.3 LMG off a 07 tahoe. Gonna keep it stock internaly. How much power is it going to make?
List of mods: Ls2 or ls3 manifold,(havent decided, ls2 or ls3 GM performance "race" computer, longtubes)
My ls1 is getting sold then I'm gonna see about boosting the LMG but for now, gonna run it like it is. So how much power can I expect out of this. Should be close to an ls1 right?
List of mods: Ls2 or ls3 manifold,(havent decided, ls2 or ls3 GM performance "race" computer, longtubes)
My ls1 is getting sold then I'm gonna see about boosting the LMG but for now, gonna run it like it is. So how much power can I expect out of this. Should be close to an ls1 right?
09-30-2008, 08:17 PM
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https://ls1tech.com/forums/showthrea...371&highlight=
http://en.wikipedia.org/wiki/GM_Vortec_engine
[edit]
Generation IV
First introduced in 2005, the Generation IV Vortec 5300 engines share all the improvements and refinements found in other Generation IV engines. At present, four versions of the 5300 are in production: 2 iron block versions (LY5 and LMG) and 2 aluminum block versions (LH6 and LC9). All versions feature the Active Fuel Management system.
LMG
The LMG Vortec 5300 is the flexible-fuel version of the LY5. Power and torque ratings for SUV and pickup truck applications are the same as each application's LY5 rating.
LMG applications:
2007-present Chevrolet Avalanche
2007-present Chevrolet Silverado 1500
2007-present Chevrolet Suburban 1/2 ton
2007-present Chevrolet Tahoe
2007-present GMC Sierra 1500
2007-present GMC Yukon
2007-present GMC Yukon XL 1/2 ton
Generation IV
First introduced in 2005, the Generation IV Vortec 5300 engines share all the improvements and refinements found in other Generation IV engines. At present, four versions of the 5300 are in production: 2 iron block versions (LY5 and LMG) and 2 aluminum block versions (LH6 and LC9). All versions feature the Active Fuel Management system.
LMG
The LMG Vortec 5300 is the flexible-fuel version of the LY5. Power and torque ratings for SUV and pickup truck applications are the same as each application's LY5 rating.
LMG applications:
2007-present Chevrolet Avalanche
2007-present Chevrolet Silverado 1500
2007-present Chevrolet Suburban 1/2 ton
2007-present Chevrolet Tahoe
2007-present GMC Sierra 1500
2007-present GMC Yukon
2007-present GMC Yukon XL 1/2 ton
09-30-2008, 08:20 PM
#4
Hmmm. OK. I thought the GEN IV motors all had 4" or larger bore or had the newer style heads. I still think it belongs in the GEN III area since I see a lot more 5.3 information there.
And besides, you asked if it would make as much power as an LS1.
And besides, you asked if it would make as much power as an LS1.
09-30-2008, 08:26 PM
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It's a gen 4 motor so .... it belongs here
09-30-2008, 08:32 PM
#6
OK, does this 5.3L motor have the newer heads like the L92? I thought I heard at one point that GM was thinking about making a small bore L92 style head.
If it has cathedral port heads, then the LS3 intake manifold will not work.
Likewise, if it has the L92 style heads, the LS2 manifold will not work.
Do you plan to do anything other than the car intake and longtubes?
If not, you will probably not see as much power as an LS1 because of the 5.3's smaller bore, smaller intake vlave, and smaller cam.
If it has cathedral port heads, then the LS3 intake manifold will not work.
Likewise, if it has the L92 style heads, the LS2 manifold will not work.
Do you plan to do anything other than the car intake and longtubes?
If not, you will probably not see as much power as an LS1 because of the 5.3's smaller bore, smaller intake vlave, and smaller cam.
09-30-2008, 08:36 PM
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OK, does this 5.3L motor have the newer heads like the L92? I thought I heard at one point that GM was thinking about making a small bore L92 style head.
If it has cathedral port heads, then the LS3 will not work.
Likewise, if it has the L92 style heads, the LS2 will not work.
Do you plan to do anything other than the car intake and longtubes?
If it has cathedral port heads, then the LS3 will not work.
Likewise, if it has the L92 style heads, the LS2 will not work.
Do you plan to do anything other than the car intake and longtubes?
I dont plan on doing anything besides the car intake and lontubes.
The next step is going to be turbo but that will be next year or maybe even later.
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09-30-2008, 08:43 PM
#8
Hmmmmm. You might get real close to what the LS1 was rated at which was 305-325. I think the newer 5.3 motors are rated at 300 also. You might get between 300 and 320 or so at the wheels with a good tune.
09-30-2008, 08:46 PM
#9
Are you stuck on getting a GM intake manifold; or can you swing an aftermarket one? If the motor turns out to have cathedral port heads, the BBK intake is not too expensive, can be slightly ported and polished, and has an 85mm TB opening.
09-30-2008, 08:47 PM
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edit: did a search and foung the info. https://ls1tech.com/forums/showthrea...er+casting+l92
09-30-2008, 09:01 PM
#11
OK so you will be able to look at the heads and know what is up. I really think they are going to be the cathedral port heads, so at least you will have a few intakes to choose form.
10-04-2008, 08:22 PM
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I also picked up one of these 5.3s with the 799 head. tried searching the 799 head and couldnt find any direct info on it but all the searches kept leading me toward the LS6. so i got the parts guy at my dealership to look up the cylinder head PN for the vehicle my engine came out of and for a C5 Z06 vette and both are the same PN. went and measured the valves and sure enough it has 2 in intakes and 1.55 exh i think it was. Either way same head as the LS6 head. So deff keep those heads they flow great. Same as the 243 head just different number. I think that may be because the 799 is on the gen IV engine. It was the bare head PN that was the same for both vehicles.
10-04-2008, 08:40 PM
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ok so i just searched it somemore and found the info on the 799 head. didnt know that head was actually put on the vette. oh well thought i had something new haha .guess not. well either way i guess it will work great with my setup. learn something new everyday!
10-05-2008, 08:25 PM
#20
Just read a magazine article (either Chev Hi Performance or Hot Rod, can't remember)on a 5.3, changed the heads and cam and made over 400+ hp. They then put a maggie on it and got about 550....So yes they make power and will rev pretty high. It was a stock block and internals.