max bore on 5.3?
Bilster, what kind of ultrasonic tester are you using and where are you checking? How are you calibrating it? I ask, because you didn't clarify whether your results were for overall thickness of the whole cylinder (alum + iron sleeve) or just the iron sleeve. I, personally, get wacky numbers with mine when trying to sonic test ferrous metal that is press fit into aluminum..
how many people have done the 5.3 bored to a 5.7? any body got an average wall thickness of a 5.3? iv done got 200 in machine work already and machine shop is saying it cant be done...... its a 1999 cast iron block.. lm7
There's a thread in this section from 2 or 3 months ago that the op talks about boring a 5.3 to the 6.0 bore and sonic checking it and he claims that the 5.3 at the 6.0 bore still is thicker than a gen1 350's walls . I would'nt do it but 5.7 for sure I would do .
There's a thread in this section from 2 or 3 months ago that the op talks about boring a 5.3 to the 6.0 bore and sonic checking it and he claims that the 5.3 at the 6.0 bore still is thicker than a gen1 350's walls . I would'nt do it but 5.7 for sure I would do .
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I bored my 2005 L33 5.3 liter HO block out to 3.898 a few weeks ago. Checked out great. looks great. Has all the advantages of an LS6 block as described in the earlier posts. Whole motor only cost me $705 complete. I just paid $300 for cleaning, boring with a torque plate, and cam bearings though. Still.. One helluva deal. I have much more money going into it though. NOT a forged bottom end. LS6 pistons and rods. ARP rod bolts. Rods honed after. Double roller and the list goes on. MS4 cam just went in. 243 heads CAME WITH THE MOTOR STOCK. weaker valvetrain than the LS6 though.
GEN-IV AL BORE @ 98mm 
Hi John, many here in CA./NV. use the GEN-IV AL crankcase for off road racing AFTER Sleeves are installed.
My observation, AFTER SONIC, is a MAX BORE of 98mm as common without sleeves.
I ALSO install my 4.1" forged crankshaft/forged rods/forged pistons in the crankcase. (LS-383)
Lance
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Teching In
Joined: May 2018
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6.2 heads on a 5.3 Wondering if a 5.3 can stand a 4.000 bore with either a turbo or pro charger I have 6.2 heads. Blew the bottom end of my stock 6.2 after doing work to the top end and want to build something stronger
