jca

Hi guys just wondered how far I can bore a 5.3 cast truck block and still run boost

KCS

iTrader: (20)

3.905".

Darkman

iTrader: (2)

https://ls1tech.com/forums/generatio...liability.html

jca

Thanks for that guys so basically can run a ls1 346 piston

jca

Hi my machine shop is bit worried bout taking it out that far I'm mainly thinking its a lot easier to get a dish piston to suit 3.905 with after market rod 6.125 927 pin don't seem to be able to find any thing to suit a 5.3 with after market rod if any body knows of a supplier that sells a 5.3 piston to suit let me know otherwise I'll go the 3.905bore

redtan

iTrader: (5)

For boost you might as well keep as much liner thickness as possible and run a stock bore piston. You won't miss the extra cubes and at 3.905 the liner will be real thin by that point.

SSCamaro99_3

iTrader: (1)

I was curious about that, but do not have near the technical knowledge to say anything. I was thinking why not put in a good rotating assembly, leave as much thickness as possible, and turn the boost up.

redtan

iTrader: (5)

The beauty about the 5.3 is that it comes with really thick liners (thus being able to be opened up to 3.905 and still be good for N/A) so it can hold boost very very well. With forged pistons and rods and you can just boost the **** out of it.

Burken01

iTrader: (88)

I punched a 5.3 to 5.7 and had no problems..

Plenty of people have and boosted the crap out of them..

redtan

iTrader: (5)

Boring out an iron 5.3 to a 5.7 and boosting the crap out of it is a little different than boring out an aluminum 5.3 to a 5.7 and throwing down the same amount of boost.

KCS

iTrader: (20)

I'm pretty sure someone here (Steve @ RED?) just posted some measurements and said the aluminum 5.3L punched out to 3.905" has the same wall thickness as a stock LS2.

Burken01

iTrader: (88)

Oh he didn't specify iron/aluminum

He said cast truck block.. Which would be iron

jca

My biggest problem is trying to get a 5.3 dish piston to suit a .927 pin conrod any ideas ?

oange ss

iTrader: (50)

why do you need a dished piston ?

jca

Hi because I m running boost and want to get comp down to as close to 9.0 as possible

Black98s10

Why not keep it at 9.5:1? Stis comp. is still pretty boost friendly, especially with the forged pistons. You don't want to go to low on compression, might be a dog out of boost. IMO, I'd run 9.5 and a meth kit.

JoeNova

I thought the 5.3s and the 5.7s had the same bore spacing? So if you bore out the 5.3, it will have the same amount of material between the cylinders as the 5.7.

No point in boring out a block if you plan on cramming boost down it, though.

KCS

iTrader: (20)

That logic would apply if it were a siamesed block, but it's not. Otherwise, you could bore a 5.3L block to 4.200" since it has the same bore spacing as an LSX block, but the LSX can go that far because it is siamesed.

bottlefedbaby

Exactly what I would do.