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Old Oct 29, 2013 | 07:12 PM
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Default ls6 bore measure
Since you know I have a brand new ls6 block. I measure bore before I can order the piston. I use capilor digital measure some bore show 3.867 It suppose stock bore which is 3.898? What size pistons should I order? ahead 3.898 or new bore to 3.902?
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Old Oct 29, 2013 | 07:27 PM
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forget to add. Some bore I remeasure. Some showing 3.790-3.880
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Old Oct 29, 2013 | 07:39 PM
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Don't order pistons yet, you need to talk to a engine builder.. Those measurements are swinging crazy, 3.79?That's what a normal 5.3 block is??

So much inconsistency here
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Old Oct 29, 2013 | 07:52 PM
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That's a huge swing in bore size...are you sure you have a new LS6 block?

I would take it to a machine shop and have them fit a 3.903 or 3.905 piston.
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Old Oct 29, 2013 | 08:08 PM
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Sounds like he is just measuring it wrong, I hope so..
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Old Oct 29, 2013 | 09:24 PM
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Get a machine shop to measure it. You can't measure something like a block with calipers.
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Old Oct 29, 2013 | 11:04 PM
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Originally Posted by LS1MCSS
Get a machine shop to measure it. You can't measure something like a block with calipers.
That what Im using caliper digatial. It probably not doing right. Must be special dail gauge?

Yes new ls6 block with stock bore. Block casting number is 12561168
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Old Oct 31, 2013 | 02:13 AM
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Originally Posted by Go5.3tt06

That what Im using caliper digatial. It probably not doing right. Must be special dail gauge?

Yes new ls6 block with stock bore. Block casting number is 12561168
Just tell your engine builder/machinist what you want and let him order the parts..

All of the bores should be rather close..

Where did you get the block? Any pics?
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Old Oct 31, 2013 | 03:37 AM
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Originally Posted by Go5.3tt06
That what Im using caliper digatial. It probably not doing right. Must be special dail gauge?
...
A caliper (digital or otherwise) is not the right tool for measuring bore diameter...

you should be using a bore gauge with a micrometer.
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Old Oct 31, 2013 | 08:19 AM
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you need one of these, and if you don't have engine building experience I wouldn't try your hand at engine building if your using a dial caliper to measure bore diameter
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Old Oct 31, 2013 | 08:47 AM
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^^^^^most accurate tool to use, calipers are not the right tool for the job
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Old Nov 1, 2013 | 04:16 PM
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Originally Posted by zzcamaro00


you need one of these, and if you don't have engine building experience I wouldn't try your hand at engine building if your using a dial caliper to measure bore diameter
That one what I been talk about. I don't know what it call. But got it. Thank you. I just need measure and order parts and have machine shop assembly it for me. Because I don't know how to measure right to set up rings files. Other things Im pretty goof with stuff to put back together.
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Old Nov 2, 2013 | 05:42 PM
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Originally Posted by Go5.3tt06
That one what I been talk about. I don't know what it call. But got it. Thank you. I just need measure and order parts and have machine shop assembly it for me. Because I don't know how to measure right to set up rings files. Other things Im pretty goof with stuff to put back together.
if i were you, i would let the machine shop do all the measuring for you.
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Old Nov 3, 2013 | 04:32 AM
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Originally Posted by Go5.3tt06
That one what I been talk about. I don't know what it call. But got it. Thank you. I just need measure and order parts and have machine shop assembly it for me. Because I don't know how to measure right to set up rings files. Other things Im pretty goof with stuff to put back together.
here's a couple pics from my build that may help you.

dial bore gauge:


measuring ring gap with feeler gauge:
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