5.3 crank
Dec 6, 2009 | 05:10 PM
#2
from the tech "The 5.3L, 5.7L, 6.0L, and 6.2L all share the same critical dimensions except for bore size" https://ls1tech.com/forums/generatio...l-stroked.html post #10
so yes, the crank's stroke is the same.
so yes, the crank's stroke is the same.
Dec 6, 2009 | 06:09 PM
#3
but are they interchangeable between said various engines due to balancing issues? Obviously a 6.2 is gonna have bigger/heavier pistons than a 5.3 so I'd think you'd need to rebalance your rotating assembly but I dunno how important an issue that really is.
Dec 6, 2009 | 06:26 PM
#4
The 5.3L had the same stroke as the 5.7L & 6.0L and it had the same 12552216 casting that was used for the 5.7L and 6.0L. The 5.7L cranks weighed about a pound less than the others though due to having a 24.5 mm hole drilled right through the center of the second, third, fourth and fifth journals. You can be pretty sure that the balance was unique to this application, because the pistons weighed 434 grams which is more than the 5.3L and less than the 6.0L.
If you pick up a crank from one of the different displacement motors, you would just need to make sure to have it balanced to the rest of your rotating assembly. You could probably get away just fine not balancing the assembly as long as you were never intending on pushing it too many rpm's, sort of like the older 305 vs 350 cranks, they were the same but balanced differently as well and people swapped them all the time. It's not the perfect thing to do, but it will work.
On a side note, even though they are the same part number, you don't want to use a crank from a 5.3L or 6.0L in an early LS1. The reason the cranks were gun-drilled is because the early blocks did not have bay to bay windows to equalize the pumping losses. At first they started drilling the blocks for better equalization and then they finally started casting larger windows in the main webbing starting with the LS6. The main thing to look out for if you use a crank originally from an LS1 is to make sure the core plug is installed in the rear flange (the pilot area) or you will have a massive oil leak.
If you pick up a crank from one of the different displacement motors, you would just need to make sure to have it balanced to the rest of your rotating assembly. You could probably get away just fine not balancing the assembly as long as you were never intending on pushing it too many rpm's, sort of like the older 305 vs 350 cranks, they were the same but balanced differently as well and people swapped them all the time. It's not the perfect thing to do, but it will work.
On a side note, even though they are the same part number, you don't want to use a crank from a 5.3L or 6.0L in an early LS1. The reason the cranks were gun-drilled is because the early blocks did not have bay to bay windows to equalize the pumping losses. At first they started drilling the blocks for better equalization and then they finally started casting larger windows in the main webbing starting with the LS6. The main thing to look out for if you use a crank originally from an LS1 is to make sure the core plug is installed in the rear flange (the pilot area) or you will have a massive oil leak.
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