ZO6 LS6 internal engine question
01-30-2010, 04:44 PM
#1
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ZO6 LS6 internal engine question
Question of the day, yes I searched.
When did GM start putting the full floating wristpins in ZO6 LS6 engines? I thought 2005 ??? I'm in need of a couple (2) stock LS6 pistons with rods and the ones I'm replacing are full floating (2005 CTS-V)
Thanks, Tom
When did GM start putting the full floating wristpins in ZO6 LS6 engines? I thought 2005 ??? I'm in need of a couple (2) stock LS6 pistons with rods and the ones I'm replacing are full floating (2005 CTS-V)
Thanks, Tom
01-31-2010, 10:23 PM
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It's my understanding that the LS2 engine got the floating pins.
The Corvette-spec LS6 was identical from '02 through '04.
*edit: Google searching found this thread that said 2005 LS engines got the floating pins and piston durability should be more than the 200,000 miles of previous engines among other benefits.
Scroll down a bit, it has a section just about the pins.
http://www.fastfieros.com/enginesava..._ls1ls2ls6.htm
The Corvette-spec LS6 was identical from '02 through '04.
*edit: Google searching found this thread that said 2005 LS engines got the floating pins and piston durability should be more than the 200,000 miles of previous engines among other benefits.
Scroll down a bit, it has a section just about the pins.
http://www.fastfieros.com/enginesava..._ls1ls2ls6.htm
Last edited by ~Josh; 01-31-2010 at 10:29 PM.
02-01-2010, 12:10 AM
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I could be mistaken, but I don't think the LS6 ever got full floating pins in production.
The LS6 is the evolution in the LS1, which had press-in pins. Engine ran 2001-04 in the vette, and 2004-05 in the caddy. I have detailed books on the LS6 up to 2003, and they were press-in. The only factory mods done to the engine that I know of were in 2002, when they improved the block breathing and cam profile.
Tear down your block and look at the pins on your good cylinders. If they are free-floating, the only reason I can think of is aftermarket. If they aren't, stock LS1 pins are interchangeable.
The LS6 is the evolution in the LS1, which had press-in pins. Engine ran 2001-04 in the vette, and 2004-05 in the caddy. I have detailed books on the LS6 up to 2003, and they were press-in. The only factory mods done to the engine that I know of were in 2002, when they improved the block breathing and cam profile.
Tear down your block and look at the pins on your good cylinders. If they are free-floating, the only reason I can think of is aftermarket. If they aren't, stock LS1 pins are interchangeable.
02-01-2010, 01:42 PM
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I guess I have the only factory freak LS6 with floating wristpins...not really, GM did it just not very long. Sometime in 04 and continuing thru 05 until the LS2 started going in Caddys they put floating wristpins into LS6s using the LS2 style bushed rod. My best contacts at GM are scratching their heads but will get back with me.
02-01-2010, 01:45 PM
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This engine has a vin stamped in it and it looks like it only ran for a min or two, bearings look out of the box new.
Last edited by torkman15; 02-01-2010 at 01:47 PM. Reason: Quoted myself
02-01-2010, 03:55 PM
#8
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BTW, that's the same part number piston as the 05 CTS-V LS6 piston. GM shows none in stock
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Last edited by SDPC; 02-01-2010 at 04:01 PM.
02-01-2010, 06:25 PM
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I guess I have the only factory freak LS6 with floating wristpins...not really, GM did it just not very long. Sometime in 04 and continuing thru 05 until the LS2 started going in Caddys they put floating wristpins into LS6s using the LS2 style bushed rod. My best contacts at GM are scratching their heads but will get back with me.
02-04-2010, 10:52 AM
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St. Jude Donor '09-'10-'11
From my data the LS1 and LS6 had floating wrist pins starting in 2004 production as with the small block v8 truck line of engines.
07-26-2019, 09:55 AM
#13
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From my research it looks like "late 04" got floating pins. My Z06 was made in March of 04.. I'd really like to know what I have.
Last edited by wydopnthrtl; 07-26-2019 at 09:56 AM.
