I've got a lead on a good deal for a LS4 longblock. It's a 5.3 liter out of an '06 Impala SS. I am wondering if this is something I can build up with truck parts and put in a truck or if the engine is completely different.

 

the ls4 has 243 heads on it. not sure if bolt patern is the same

 

the engine itself should have all the same bolt patterns, but it is aluminum.

You should look at the economic side of it: What can you reuse, what will you have to sell (will you be able to sell). What is the water pump routing? It would be interesting to know if that engine with it's compact accessory package would clear everything in the truck bay.

 

Dont think it will work. Why not find a L33 they make more power and everything fits!



The heart of the Grand Prix GXP is the new LS4 5.3-liter V-8 - the first time in almost 20 years that a V-8 engine has been offered in a Grand Prix. It also is the first application ever for the small-block V-8 in a front-wheel-drive configuration.

Engineered specifically for front-drive layouts, the LS4 produces an estimated 303 horsepower and 323 lb.-ft. of torque - with 90 percent of torque available from 1500 rpm to 5200 rpm. It also incorporates Displacement On Demand (DOD) technology, which debuted in 2005 GM extended midsize SUVs equipped with the Vortec 5.3-liter LH6 V8 engine.

With the LS4, DOD technology enables fuel economy gains of up to 12 percent in certain driving conditions by reducing the number of cylinders engaged in the combustion process. A sophisticated engine controller determines when to deactivate cylinders, allowing the engine to maintain vehicle speed in lighter-load conditions such as highway cruising. When the cylinders are deactivated, the engine effectively operates as a V-4, with alternate cylinders on each cylinder bank disabled. The engine returns to V-8 mode the instant the controller determines the vehicle speed or load requires additional power. The process is seamless and virtually imperceptible.

"There's nothing like the satisfying feel of a V-8 engine and the LS4 provides a level of performance rarely available in competitors' vehicles," said David Muscaro, assistant chief engineer of small-block V-8 for passenger cars. "But when all eight cylinders aren't required to maintain performance, DOD technology effectively turns the engine into a more efficient V-4."

The all-aluminum LS4 is based on the Gen IV small-block architecture, but is modified to accommodate the "east-west" mounting position of the Grand Prix's front-wheel-drive chassis. To fit the "sideways" positioning in the Grand Prix, several changes were made to reduce the engine's overall length, including the use of a shorter crankshaft and a single-belt accessory drive system.
Other LS4 features include:

Aluminum engine block with cross-bolted main bearing caps
Aluminum high-flow cylinder heads similar to the 6.0-liter LS2 V8
Full-floating pistons
Lightweight, three-piece friction-welded composite intake manifold
10:1 compression ratio for fuel-efficient performance
Unique camshaft designed to accommodate DOD technology
Electronic throttle control integrated with new engine controller
GM Oil Life System to minimize required oil changes
Iridium-tipped spark plugs for 100,000 mile service

 

Thanks for the heads up trever. I am thinking either a L33, or an LQ4. The only reason I even thought of the LS4 was that I can get a longlock for $300. But i've been seeing the L33's and LQ4's around 1,500-2,500 at salvage yards so that may be the best way to do it, just buy it right the first time. Trever, what compression does a stock L33 have? I am kicking around the idea of a supercharged 5.3 like yours, just downscaled a little due to budget.

 

The L33 is 9.9 to 1 compression ratio. I think i'd do the Lq4 just for the cubes but the L33 is proven to be quite a strong performer for me.

 

L33 9.9:1 310 hp slight bit more lift, same duration at LM7
LM7 9.4:1 295 hp

peace
Hog

 

thanks for the quick replies. I am still up in the air as for what I want to do with my 2006. I know either way the stock V6 is going to the wayside as soon as warranty is close to expiring, or whenever I have the funds to do so. I just wonder how long a stock MG5 5 speed will hold up behind a LQ4/9? I will be going with a T56 in due time, but funds will determine that as with everything else. I would like to run the stock MG5 5 speed for a while until I can afford a T56.

 

If its a complete longblock, $300 is a steal. Heads alone will bring more than that.

 

that's kind of what I was thinking, they're 242 castings so they have to be worth something. Maybe ill pick it up and part it out, or use it as a coffee table.