LS-3 parts on LSX

[fourmz]

I am considering the purchase of an LSX crate motor. I already have an LS-3 and my question is what parts can I carry over from my LS-3 and what parts would I have to buy to make a complete motor?

[dmax86]

I have had the same thoughts!...

[Andro]

Pretty much everything on your LS3 motor will bolt right onto the LSX block. If your going to be running it forced fed I would suggest getting a pair of LSX heads to use the extra head bolts for more clamping power when using force fed applications

[The_Blur]

The LSX is basically a beefier LS3. Everything will fit.

[Russell James]

I can't think of much you would want to use. Sure it would all bolt on, but you would then have .... a very heavy LS3.

The only reason to go to an iron block LSx would be for big cubes, huge boost.... which all means different crank, rods, pistons, heads, cam, intake, clutch...

If your not going for massive boosted power, the alum block will handle quite a bit. With all the supercharged LS3's running around, anyone ever heard of a block failure?

Then, if you build a massive hp LSX you will need everything behind it... clutch, trans upgrades, driveshaft, rear diff, axles.... fuel and cooling system upgrades...

[2SSRS@Gen5diy]

If you have a M6 car and get the LSX 454 then you need a new flywheel The one on the LSX454 has 2 more bolts on the flywheel, And for the A6 a new flex plate with the 2 extra bolts.

[fourmz]

The weight was one of my main concerns. Im just weighing some options, I just passed on an LSA from a rear damaged CTS-V. An LS-9 would be nice as well. Probably just end up going with a supercharger.

[2SSRS@Gen5diy]

Originally Posted by Russell James

I can't think of much you would want to use. Sure it would all bolt on, but you would then have .... a very heavy LS3.

The only reason to go to an iron block LSx would be for big cubes, huge boost.... which all means different crank, rods, pistons, heads, cam, intake, clutch...

If your not going for massive boosted power, the alum block will handle quite a bit. With all the supercharged LS3's running around, anyone ever heard of a block failure?

Then, if you build a massive hp LSX you will need everything behind it... clutch, trans upgrades, driveshaft, rear diff, axles.... fuel and cooling system upgrades...

Not trying to piss you off but the OP said.

I am considering the purchase of an LSX crate motor.

So your comment was off point,

There are only 2 LSX crate motor, At this time its the LSX376

Parts #19171049
"The affordable LSX crate engine has arrived! GM Performance Parts takes the economical LSX Bowtie block and combines it with the LS3’s high-flow L92-style heads and mostly internal components (we swap the pistons for forged parts), to create the affordable, high-revving LSX376 crate engine. It represents the essence of LS performance—exceptional airflow capability in straightforward packaging that delivers huge performance without a power-adder. We deliver the LS376 without an intake manifold (and other accessories). So, whether you top the engine with a carburetor or production-style injection system, it’s suitable for your street rod, ’57 Chevy or ’71 Camaro —be it on the street or strip. Our horsepower and torque ratings are based on using the productionstyle injection system. More power can be realized by swapping that for one of our carburetor intakes and a well-tuned Holley four-barrel. NOTE: Due to the number of application variations, the LSX376 crate engine is supplied with a dust shield instead of an oil pan. See the LS Engine Components section for production-style oil pan choices. Also, the LSX376 valve covers do not include provisions for mounting the ignition coil brackets. Aftermarket or custom relocation brackets must be used."

Or the LSX454.

Parts #19244611
"(Does not include the intake manifold as shown in the photo) Vintage displacement. thoroughly modern technology. stunning performance. An engine with 454 cubic inches of displacement will always be associated with higher-performance Chevys, and that tradition continues with the all-new LSX454 crate engine. We started with the LSX Bowtie block (see page 200 for more info), stuffed it with an all-forged, super-tough rotating assembly, bolted on a pair of our new deep-breathing LSX six-bolt cylinder heads and topped off the combination with a high-rise intake/four-barrel induction system. The new LSX six-bolt cylinder heads are based on the racing-derived LS7 heads that help deliver more than 500 horsepower in the Corvette Z06. They enable tremendous low-end torque and great high-rpm power. It also comes dressed with great-looking, all-new orange powder- coated valve covers with “LSX454” logos engraved and painted black. We tested the LSX454 combination on none other than Reggie Jackson’s custom 1969 Camaro, which showcased the possibilities of high 10s in the quarter-mile, 150-mph top speed and more. NOTE: Due to the number of application variations, the LSX454 crate engine is supplied with a dust shield instead of an oil pan. See the LS Engine Components section for production-style oil pan choices. Also, the LSX454 valve covers do not include provisions for mounting the ignition coil brackets. Aftermarket or custom relocation brackets must be used."

If you go with the 376 you can use your intake and exhaust, But the 454 needs the LS7 intake and fuel injectors, on the exhaust side the shape of the port is more D shaped the you LS3.

[2SSRS@Gen5diy]

Originally Posted by fourmz

The weight was one of my main concerns. Im just weighing some options, I just passed on an LSA from a rear damaged CTS-V. An LS-9 would be nice as well. Probably just end up going with a supercharger.

If you run headers and coilovers you save 50lb in the front so for 70lb more you get an all forged motor i will pay the price, Think of it you can run a 400HP spray and not have to hope you rods don't snap or melt a piston.

[jrpxxii]

If your going for a boosted setup you need to go with a 427. For a boosted application you are looking for lower compression with cubic inches and 6 bolt to hold the heads on from boost.