'07 LMG 5.3 truck motor: How much power is it going to make?
07-26-2011, 10:25 AM
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Hopefully picking up a burb with the lmg this weekend. Anyone else try building one? I'm looking to get similar numbers out of it.
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.
07-27-2011, 07:55 AM
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the LMG 5.3 is a 310bhp DoD engine with flex-fuel capability. You will want to delete the DoD system before you install it unless you have a means of controlling it. (which you wont if its going into an older Fbody) You'll basically need a valley cover and lifters, maybe one or two more parts to get rid of the system. The 799 heads are cathedral port truck versions of the 243 castings. the flow numbers are identical. The intake that will come on that engine will actually work really well if you have room for it. It has an 87mm opening (which can easily be enlarged) and the intake itself will give better response through the mid and low range and carry the RPM and power better up top where the car intake lacks. The most sure way to tell what reluctor is in the engine without pulling the pan is to see what PCM it is being ran with. If its an 0411 PCM, it'll be 24x and the E38's run the 58x engines, One of the Lingenfelter conversion boxes can take care of this, the cam sensor location and signal and they also have a knock sensor extension harness that will allow you to relocate your sensors to the side of thew block (you'll need to drill/tap the holes for your sensors.
07-27-2011, 08:08 AM
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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 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.
If I were you I'd go back to the GEN III section and read some of that info you say there's so much of.
Keep the truck manifold (have I said that yet? LOL) You can get any throttle body you need for it.... cable or DBW, any size
