Duramax Diesels Forum Truck of the Week
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Old 01-31-2019, 10:39 PM
ThreeQuarterTon ThreeQuarterTon is offline
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Default Engine build crankshaft help

Long story short, bought a block, crank and cam from a guy who had a handful of motors pulled from lb7-lbz and parted. Picked out the best of the cranks from his pile. Problem now is, I realized after the fact, depending on what year crank you have depends what balancer to order for my build. Now Iím aware this is for balancing Purposes of the rotating assembly. Markings on the cranks appear to have no rhyme or reason indicating what engine RPO it came out of. Is there a way to identify the differences? Or better yet, since the rotating assembly will be getting balanced anyway, does it even matter which balancer I order? For example if I were to order an lly balancer but crank turns out to be from an lbz, Will this cause issues getting the dang thing balanced? Not bad for a first post ay
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Old 01-31-2019, 11:17 PM
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They just need to match flywheel and balancer as a set.
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Old 02-01-2019, 06:15 AM
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Get the lbz flexplate and damper. Would rather remove weight then add.
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Old 02-01-2019, 07:28 AM
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Quote:
Originally Posted by Ne-max View Post
Get the lbz flexplate and damper. Would rather remove weight then add.
should be other way round. when GM pulled piston weight for the LBZ, they added it back in at the flywheel/balancer instead of taking it off the crank.
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02 LB7, LLY, LBZ, LMM, LML, L5P 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

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Old 02-01-2019, 10:41 AM
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should be other way round. when GM pulled piston weight for the LBZ, they added it back in at the flywheel/balancer instead of taking it off the crank.
When I bought my crank and damper from socal they said lbz on both. Had to remove some weight.
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Old 02-01-2019, 05:02 PM
ThreeQuarterTon ThreeQuarterTon is offline
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So then I’ll buy SoCals lbz flexate and ATI lbz damper is what I’m understanding from everyone? Or other way around and get the lly
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Old 02-01-2019, 05:12 PM
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So then Iíll buy SoCals lbz flexate and ATI lbz damper is what Iím understanding from everyone? Or other way around and get the lly
Confirm it when you order it them. Gabe is awesome to work with.
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Old 02-01-2019, 05:34 PM
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^^this. Guy is the one who showed me the difference between factory balancers/flex plates and why they added weight to the later models.
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Quote:
Originally Posted by JoshH View Post
Mike L is my role model. I want to be like him when I grow up.
James

02 LB7, LLY, LBZ, LMM, LML, L5P 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
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