aluminum 5.3 block???

[1BAD6660]

i can get my hands on a aluminum block 5.3 out of a GMC Envoy that was losing oil pressure it was rattling at lil bit at idle with low oil pressure but it still ran very strong(no smoking), is this a good block to rebuild vs a 5.3 or 6.0 iron block, im wondering because im looking to do a v8 swap in my 03 silverado...yall tell me what i should do with it...

[truckinL33]

If it's free, take it.

[1BAD6660]

ok, ya its free, is it any better than a iron 5.3?? what s the diffrences just weight or is there a HP diff??

[truckinL33]

The aluminum 5.3 was rpo code L33, ask me how I know . It came with 799 casting heads, same as 241. It's better than your run of the mill iron 5.3, and it weighs less. I don't know what you're planning to do with it, but it would be a nice heads/cam drop in for any short wide.

[PitchBlackC3]

The aluminum 5.3 was rpo code L33, ask me how I know . It came with 799 casting heads, same as 241. It's better than your run of the mill iron 5.3, and it weighs less. I don't know what you're planning to do with it, but it would be a nice heads/cam drop in for any short wide.

How do you know?

The 799 head is the same as a 243, not a 241. The L33 also has flat top pistons to gain back the compression lost with the 243s.

[truckinL33]

I ment 243, thank you for the correction. I know because my handle on here is truckinL33. Why is it L33? Because I have one in my truck. I'm actually surprised to hear that it came in Envoys factory, that's pretty badass.