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What rods do I use?

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Old Mar 17, 2010 | 04:01 AM
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Default What rods do I use?

Anyone know what rods are used with LS6 crank part # 12583565, full floaters or pressed pin? I'm getting conflicting data from GM LS6 specs.
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Old Mar 17, 2010 | 08:15 AM
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It doesn't really matter, either will work just fine. I'd go with the floating pin though, they're easier and faster to assemble.
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Old Mar 17, 2010 | 08:34 AM
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Pressed pins are sooooooo much fun to install. LOL
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Old Mar 17, 2010 | 09:46 PM
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I was under the impression the floaters were heavier and thus required the proper crank for balance. Not that critical in a NA street motor?
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Old Mar 17, 2010 | 10:45 PM
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Depends how accurate of a balance you want. The weight difference will be in the small end bushing and the c-clips. It's probably only a couple grams, which if you're just going to rely on the factory balance job, probably isn't much anyways considering the manufacturing variances are probably even worse. I think floating/pressed pin rods depend on the year, but I'm not 100% sure about that.

I was under the impression the crank would be balanced before assembly anyways.
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Old Mar 17, 2010 | 11:36 PM
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First, thanks for the reply. I wasn't sure if the floaters were all that much heavier. I should just weigh them!
You're right, I should just have it balanced, however it was factory balanced and I have both sets of rods and pistons.
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Old Mar 20, 2010 | 12:02 AM
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Ok. So I weighed the 2 sets of rods/pistons. The full floater set up weighs 70 grams more than the press fit set up. That sounds like a lot to me. I'm still wondering what rods/pistons I should use with this crank. Anyone?
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Old Mar 20, 2010 | 09:27 AM
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Originally Posted by 5150.4.67
Ok. So I weighed the 2 sets of rods/pistons. The full floater set up weighs 70 grams more than the press fit set up. That sounds like a lot to me. I'm still wondering what rods/pistons I should use with this crank. Anyone?
Wow, 70 grams? Did you just weigh the piston and rod together, or are they seperate? Rings? Bearings?
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Old Mar 20, 2010 | 04:49 PM
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Rod and piston, no bearings or rings.
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