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LS7 flywheel info needed

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Old Dec 11, 2011 | 07:47 PM
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Default LS7 flywheel info needed
recently i purchased a ls7 clutch from a forum member. the flywheel gm part number that i got with the clutch is 120496901. ive tried to look this number up on gm part sites and it doesnt come up. from what i can see the ls7 flywheel part number should be 12571611. anyone know anything about the flywheel i have? is it an ls7 flywheel? i was under the impression the ls7 flywheels where lighter...i think this is actually heavier than the ls6 flywheel. just by holding the 2 and comparing. appreciate any info or help here.

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matt
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Old Dec 11, 2011 | 08:25 PM
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Originally Posted by boilerdawg
recently i purchased a ls7 clutch from a forum member. the flywheel gm part number that i got with the clutch is 120496901. ive tried to look this number up on gm part sites and it doesnt come up. from what i can see the ls7 flywheel part number should be 12571611. anyone know anything about the flywheel i have? is it an ls7 flywheel? i was under the impression the ls7 flywheels where lighter...i think this is actually heavier than the ls6 flywheel. just by holding the 2 and comparing. appreciate any info or help here.

thanks
matt
Matt, the flywheel number you show has too many numbers. Is this a cast in number on the flywheel?
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Old Dec 11, 2011 | 08:32 PM
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Originally Posted by Eric D
Matt, the flywheel number you show has too many numbers. Is this a cast in number on the flywheel?
yes its cast into the back of the flywheel it also has LUK stamped in it as well.........
Last edited by boilerdawg; Dec 11, 2011 at 08:35 PM.
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Old Dec 11, 2011 | 08:42 PM
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Originally Posted by boilerdawg
yes its cast into the back of the flywheel it also has LUK stamped in it as well.........
If no one else chimes in I'll see what I can find for you while at work tomorrow.
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Old Dec 11, 2011 | 09:36 PM
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Originally Posted by Eric D
If no one else chimes in I'll see what I can find for you while at work tomorrow.
Eric,
Unless something has changed, I believe the casting number and part number are different for the LS flywheels. I double checked my old LS1 flywheel, and the number cast into it, does not match the GM part number in the parts manual.
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Old Dec 11, 2011 | 11:01 PM
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Originally Posted by lucky131969
Eric,
Unless something has changed, I believe the casting number and part number are different for the LS flywheels. I double checked my old LS1 flywheel, and the number cast into it, does not match the GM part number in the parts manual.
Yeah, I believe you are correct. What I can do is look the print up for the flywheel, The prints sometimes include the casting number. I can also get the nominal weight as well.
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Old Dec 12, 2011 | 07:03 AM
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Originally Posted by Eric D
If no one else chimes in I'll see what I can find for you while at work tomorrow.
Thanks for the help! I really appreciate it.

Matt
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Old Dec 13, 2011 | 09:54 AM
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Mass of LS7 to LS6/LS1 flywheel - LS7= 26.5 lbs - LS6/LS1= 25.1 lbs

If there is a Luk number for LS7 in casting it should be A1904974 or something like this.
For current LS6/LS1 flywheel part number, 12551348
For current LS7 the flywheel part number, 12571611

Hope this is of some help..
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Old Dec 13, 2011 | 10:41 AM
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Originally Posted by Eric D
Mass of LS7 to LS6/LS1 flywheel - LS7= 26.5 lbs - LS6/LS1= 25.1 lbs

If there is a Luk number for LS7 in casting it should be A1904974 or something like this.
For current LS6/LS1 flywheel part number, 12551348
For current LS7 the flywheel part number, 12571611

Hope this is of some help..
Fantastic help!! i think by what you describe i have a ls7 flywheel i just dont understand the dang goofy numbers on it.
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