Conversions & Hybrids - Stroked LS sizes
04-26-2012, 08:44 PM
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.
04-26-2012, 08:53 PM
Yes you are right, have your block bored to 3.905" and use a 4" crank, and you'll have a iron LS1 383.
04-26-2012, 09:53 PM
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...
04-27-2012, 04:50 AM
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!!!
04-27-2012, 12:13 PM
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?
04-27-2012, 09:14 PM
I do know the iron blocks can get bored way over the aluminum blocks. Just how much I don't know.
04-28-2012, 01:03 AM
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.
04-29-2012, 12:56 AM
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
04-29-2012, 07:01 PM
I was just thinking about what to do with my extra 4.8 block that has a bad piston....
04-29-2012, 07:02 PM
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.
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