kristov

Does such an engine exist?

thunderstruck507

iTrader: (18)

Not unless something is wrong with it.

Unless you are talking about an aluminum 5.3liter truck motor...which does exist, but are rare.

Troy5061

iTrader: (19)

Crank or wheel HP? If its wheel hp LS4?

kristov

Crank hp.

It can be a truck engine as long as it is based on the same design as the lsx.

Any help is appreciated!

Nick V.

iTrader: (1)

uh....i dont know if this is what your talking about but some silverdaos

have the 5.3 vortec with about that much hp

greendrazil

iTrader: (3)

What about the 4.8 truck motor?

kristov

Does it have an aluminum block?

green28

iTrader: (8)

Any reason you are looking for a less than 286 hp aluminum block LS based motor? Just curious. I think some early 5.3's were rated at 285 hp. And I think the LM4 is aluminum but probably rated higher than 286 hp.

T-Top

I am really curious as to where this question came from? Are you building a car for a kid or something?

Troy5061

iTrader: (19)

Sounds like he's building it for auto cross or something with a HP bracket/limit. The 99 5.3 truck motors were rated at only 270hp, the 01-0? were rated at 295hp, then they got bumped to 315hp I believe, iron block though. The LM4 is an aluminum block 5.3 truck motor but I belive its rated at 295hp.

ragtopz28

iTrader: (57)

See this page:
http://www.ls1fc.com/techinfo/enginegloss.htm

greendrazil

iTrader: (3)

Nice post.

kristov

In order to get the car road legal (in Norway) I can have maximum 286 hp (old BMW).

Seems like the LM4 with 290 hp is the closest I can get with aluminum block.

How much heavier are the cast iron blocks?

WSsick

iTrader: (13)

How are they going to know if you have a car with a 286hp or a 505hp LS7? Are they going to dig around until they find the part number on the block? Just curious...

kristov

They will need proof that it is the correct engine and then they wil double check it with the serial number and VIN.

Does there exist any documents regarding the emissions for the LM4?

BLK95-Z

iTrader: (2)

You could build one. Get an aluminum 5.3 and destroke it.

kristov

Unfortunately it needs to be a factory engine.

NC01TA

Now that's a strict government. Thank heavens the USA isn't there.....yet.

StuntmanMike

iTrader: (2)

You could always go with a 4.6L Caddy Northstar eninge. The base Northstar was 275hp if I recall correctly, and those are all aluminum as well. Plus a little more advanced, being DOHC engines.

71novaguy

iTrader: (2)

but then they took a step back since the starter located under the intake, in the valley between the heads. Arent they also notorious for head gasket issues?

this makes no sense. you could have an engine out of a vehicle rated at 285 hp. you can do head work, small cam, bore and stroke it, and they would never know. they are not tearing down the engine.