Conversions & Hybrids - Stroked LS sizes

So lets ee if I have tis right! A 4.8 and a 5.3 are the same block. So the crank must have a different stroke. The 5.7 and the 5.3 have the same crank so the bore is different. So if I take the the stroker crank that is used to make LS1 383 inches in the 4.8 block and bore it out I should be able to get 383 or close to it out of my extra 4.8 block. Please correct me if I'm wrong as I don't know this for sure, I am just using a little deductive reasoning.

Yes you are right, have your block bored to 3.905" and use a 4" crank, and you'll have a iron LS1 383.

The 5.3, 5.7, 6.0, and 6.2's share the same crankshafts, DIMENSIONALLY speaking. The 4.8 has a unique stroke, as does the 7.0. GM basically uses multiple bore sizing to achieve different numbers...

I was on the right track then. I will start saving and scrounging forged stroker parts for my 4.8 block. Thanks for the confirmation guys!!!

But how far can you bore the 4.8/5.3 blocks and still have a reliable street motor? Would making it a 383 be okay for FI, or would the walls be to thin?

I do know the iron blocks can get bored way over the aluminum blocks. Just how much I don't know.

A lot of people have gone to 3.905" without issue, the benefit of the iron block is you arent dealing with the sleeves like in the aluminum blocks.

Some people have taken 5.3 blocks out to 4.000 bore.. I guess a few can be machined that far..kinda pushin it tho.. Lol

I was just thinking about what to do with my extra 4.8 block that has a bad piston....

I was told by a builder that the 6.0 iron blocks can go out .090
I'd take that with a grain of salt. Call a local machine shop, see what they have to say.