Hi guys hopefully some one can tell me the 5.3 litre (3.75' bore) out of the pick ups is it the same engine as the 6.0 litre (4.00" bore) other than the bore size and how far is it possible to bore one out? any help greatly appreciated..

 

just use the search button. lots of threads. same crank and rods, different bore size and cylinder sleeves. don't bore them past 3.905

 

The 6.0 doesn't have the same crank and rods just the ls1 and 5.3 do. I did mine to 3.898 bore with no problems. I wouldnt go over that though.

 

Not all, but most 6.0L iron block engines do. Regardless, you can use the crank and rods from a 6.0L in a 5.3L, as long as the pistons are adequate.

Plus, I've heard of people boring the iron 5.3L's further than 3.905" with great success...

 

You push over 3.905 your asking for trouble. Wouldnt be reliable in my book.

 

Have you ever done it?

 

Found this thread on pg. 2....

https://ls1tech.com/forums/generatio...ore-5-3-a.html

 

Cant say I have. But I personally wouldnt I just wouldnt feel comfortable doung it is all. Just my opinion

 

I just bored mine out to 3.907. There was a minimum wall thickness of .110 and went as thick a .175 I believe. Still thicker than a 350 small block bored .060 over, and that's with taking an eighth of an inch out of there.

 

What I've read on here is although the 5.3 , 5.7 and the 6.0 share the same stroke all 3 use a different crank because of the different weights of the piston, pin, rod assemblies . Boring a 5.3 iron block usually can easily take 3.905 or more . To be sure have the block sonic checked for peace of mind .

 

New here with 2 whole posts.

The block on my 5.3 has "4.8/5.3" cast into it on the front left. Is the 6.0 the same block too?

 

No. 6.0 is different. It would have "6.0" cast into it.

 

so i guess you can bore it out to a 4.0 bore?