your numbers are on a stock motor right? are you running the gen3 or 4. just wondering if one is stronger then the other.

 

 

Yeah I'm thinkin about the LS1 bore and the stock 4.8 Rods and Crank. I'm not in a rush to build it. Just dreaming a bit haha

 

o2 motor with rod bolts it was

 

the 5.3 crank and rods might be the way to get some power for my 4.8 in my 20104wd rcsb w/3.43 and 31" tires.it's a slug






























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I'm pretty sure the only difference between a 4.8 and a 5.3 is the crank vis a vis stroke.
That being said, a 383 stroker should be a succinct possibility.
Several guys around the forum have had some amazing results from a boosted 4.8.

 

The 4.8 assembly is kind of in a world of its own, as it doesn't share anything (piston rods crank) with the 5.3. They share the same bore but each have different pistons (4.8 is flat vs 5.3 dished) the 5.3 rods and crank are the same as ls1, ls2, 6.0 (with the only changes being that ls2's and the later had floating pistons). But anyway If you want to keep the stock bore and go n/a... keep the stock pistons and go with a crank and rods from one of the other motors as someone else said so you can have a high comp 5.3.
If you decide to bore and run the 4.8 crank, you will be building a rev monster (similar to the old 302 in the z28). You can spin it to the moon, but you will have to realize... you wont be building much low end torque and will have to match everything else accordingly (ie good flowing intake, heads, cam, etc... so you have the airflow you need to be producing good power up high).
In the end the build potential with this is kinda limitless, for these new ls engines are just the modern small block... meaning that there are tons of options and things to do with them all depending on what you want.
My recommendation... decide what you want to do with the truck and how you want it to perform as a whole first, and go from there.
Personally I'm building a 383 ls6 for my 05 ecsb, because to me its about building power under the curve, and with my heavy truck... low end torque will be key in getting the pig to move out of the hole, as well as having a very usable wide powerband.

 

Here's a question. Has any one busted the rods on the 4.8L? I'm thinking a piston upgrade maybe all thats needed to keep durability. I've made 617HP on mine and since been shooting a 75 dry shot on top of that. Is it a stretch to think some good pistons and the block could live a long life at 600-700hp?

I'm thinking a light hand hone, better head gaskets, and head studs.

Around $1000 invested into setup and solid block, with good tuning kept in mind.

Thoughts?

 

thats awesome that your spraying on top of that. the way i think of it is a piston is a piston no matter what engine its in so your vulnerable to the same problems. im sure the short stroke and long rod in these motors helps greatly with the rods taking the abuse though. id love to see what one could take.

 

stock TTY head bolts, 5.3ho/5.7 mls gaskets, 800rwhp, 7500 shift points i had no issues with my motor. none so ever,

you **** a rod up cause youre motor digests fluid. you cant compress fluid so it will bend a rod, you send a rod out side of block cause rod bearing spun. prevent the two and motor is sound