59ImpalaRider

What are the advantages other than its lighter than the regular 5.3. I can get a complete conversion with 10,000 miles for 1,500 bux.

01WS6/tamu

iTrader: (37)

none other than block. same guts different package.

59ImpalaRider

So they have the same horespower rating? I see it has a shorter oil pan also.

9540x

No, the aluminum version is, I believe 285 hp stock, the iron 260, if I remember correctly. Considering you'll be swapping it into some other vehicle other than the original, you'll probably have to swap out the oil pan anyway; no reason to let that be a deciding factor. BTW, the 5.3s are awesome. I plan on swapping one into my car eventually but bored to accept LS1 pistons. Same block. If you bore the aluminum 5.3, you have something more or less identical to the much pricier LS1.

01WS6/tamu

iTrader: (37)

The cam is a little different grind but the rotating assembly is all the same.

s10-den

if you dont get it let us know where it is.

Eskimo

iTrader: (9)

My '04 Tahoe's iron block 5.3 was 295hp stock. Were you looking at the HP for the Inline 6? 260 sounds right for that..

9540x

My fault. 260hp is for the 4.8. And the 5.3s range from 285-295 depending on year. Either way, the aluminum blocks pretty much always have more HP stock. But keep in mind that with mods, they'll both make equal power.

Andy1

If it's an L33, then I believe they were rated at 310HP. Nice motor!

Andy1

philntx

iTrader: (8)

The Trailblazer/envoy motors also have exhaust manifolds that fit "more snug" to the block.

'JustDreamin'

You can't bore the aluminum block. For the same reason you can't bore the LS1 / LS6 blocks. They've got really thin cast iron liners, and can only tolerate a really small (like .010") overbore.

So, building a 5.7 out of a 5.3 block can't be done in alum like its routinely done with the iron blocks.

Don't get me wrong, I'm sure you can get Darton or one of those companies to put sleeves in your 5.3l alum block, but since that costs around $2500, its not exactly cost effective.

'JustDreamin'

59ImpalaRider

Its at my work, we dismantle new vehicles for gm, we are about to dismantle 2 07 escalades, that have basicly nothing wrong with them.

Project GatTagO

iTrader: (7)

False.

The O.D. of the 5.3L sleeves is the same as the 5.7L sleeves.

Andrew

spy2520

iTrader: (3)

the 4.2 inline 6 is rated at 275, and it feels pretty accurate...

'JustDreamin'

You sure on that? Hadn't heard that anywhere else, so just want to be sure, 'cause I don't want to spread incorrect information (which if you're correct I already did....)

'JustDreamin'

Project GatTagO

iTrader: (7)

I am 99% sure. if anyone has measurements of 5.7L sleeves I can measure the 5.3L sleeves.

Andrew

OJmobileII

iTrader: (3)

higher compression i thought, for a slight hp increase (also maybe the cam as mentioned above).

'JustDreamin'

That's close enough for me.....Thanks Andrew for setting the record straight.

'JustDreamin'

Project GatTagO

iTrader: (7)

No problem. If you think about it, from a manufacturing point, using the same O.D. sleeves makes great sense. it cuts down on the need to carry different sleeves at the foundry.

Andrew

firefighter

so whats the max bore on these 5.3L 3.905"? other than that it's the same crank and rods? and the 5.3L heads that everybody says is a LS6 head with more meat?

what I'm getting at is this is a cheap way to get an aluminum block.... The swap is becoming a little more realistic.

so theoreticaly I could get a 5.3L bore it to me chosen diameter put some forged pistons in it (which I was gonna do anyways) get the heads CNC ported put a nice cam in it a LS6 manifold and get about 450-500 HP for about 2-3K less than buying a worn out LS1 or an exspensive *** LS2......... Damn unless someone stops me and my ranting there is light at hte end of the tunnel.