Hi guys,
I watched your series on YouTube, rebuilding a GM LM7 gen. III 5.3L LS motor. During the assembly process of installing the rotating assembly it was mentioned that if the crankshaft needed to be machined or turned that it would have to be heat treated and that cost around $300.00, in addition to the cost of the machine work.
Well, I am rebuilding a GM LC9 gen. IV 5.3L aluminum LS block. I just recently dropped the block, main caps, and crankshaft at the machine shop. One of the items is turning the crankshaft .010/.010 and then polish. I understand that this crankshaft is out of a later model year than you were working with, but I am pretty sure that are the same. Both are nodular iron, and both went through the same manufacturing processes. So, the question is, if the crankshaft has to be turned .010/.010 should it be subject to additional processes like heat treating? Because a new 0 miles crankshaft from GM Parts Direct is $245.00, plus $80.00 for shipping. That comes to $325.00for the new crankshaft and it might need to be polished at most. If the cut crankshaft has to go through those additional processes or should, it will be at least $500.00. That's more than I paid for the entire short block assembly. Any input is appreciated.
Thank you,
Charles
I watched your series on YouTube, rebuilding a GM LM7 gen. III 5.3L LS motor. During the assembly process of installing the rotating assembly it was mentioned that if the crankshaft needed to be machined or turned that it would have to be heat treated and that cost around $300.00, in addition to the cost of the machine work.
Well, I am rebuilding a GM LC9 gen. IV 5.3L aluminum LS block. I just recently dropped the block, main caps, and crankshaft at the machine shop. One of the items is turning the crankshaft .010/.010 and then polish. I understand that this crankshaft is out of a later model year than you were working with, but I am pretty sure that are the same. Both are nodular iron, and both went through the same manufacturing processes. So, the question is, if the crankshaft has to be turned .010/.010 should it be subject to additional processes like heat treating? Because a new 0 miles crankshaft from GM Parts Direct is $245.00, plus $80.00 for shipping. That comes to $325.00for the new crankshaft and it might need to be polished at most. If the cut crankshaft has to go through those additional processes or should, it will be at least $500.00. That's more than I paid for the entire short block assembly. Any input is appreciated.
Thank you,
Charles
Dec 14, 2021 at 4:04 PM