stock ls1 piston ?

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Sep 26, 2010 | 09:47 AM

1baaadz28

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From: Gadsden AL

stock ls1 piston ?

I was looking at some of my pistons this morning out of my 2002 z28 and noticed they had "MAHLE" stamped on the inside of the skirts . did nahle make the pistons for GM to use or were they added to the motor later

Sep 26, 2010 | 09:55 AM

supersick99z

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As far as I know those would be a set of aftermarket pistons, but probably stock size

Sep 26, 2010 | 10:43 AM

1baaadz28

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From: Gadsden AL

they have flat tops and 3 rings and the numbers 56/22 on the piston head

Jan 22, 2020 | 07:09 PM

Fah Cue

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Quote:

Originally Posted by 1baaadz28

they have flat tops and 3 rings and the numbers 56/22 on the piston head

I finished tearing mine down today and saw the same thing. It's got mahle pistons in it.
i can tell you this bottom end has not been apart. 103k

Jan 22, 2020 | 09:27 PM

G Atsma

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I've heard that Mahle supplied OEM pistons for many GM engines. Still might..

Jan 24, 2020 | 04:30 PM

dreadpirateroberts

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Quote:

Originally Posted by G Atsma

I've heard that Mahle supplied OEM pistons for many GM engines. Still might..

I think this is correct.

Jan 26, 2020 | 01:07 PM

patSS/00

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From: AZ

The Mahle catalog does list the original LS1 pistons, which are discontinued. They do still make a version with reduced compression height. Also they're aluminum like the originals, not hypereutectic (sp?) aluminum.