Join Date: Feb 2012
PalumboCustoms is offline
Re: L31 vs L33 Differences?
L31 is old style block like all the other 350 cubic inch motors are. The L33 is a new style ls series block completely different in all aspects. You can't use 4.3L mounts on either swap. You have to buy v8 swap mounts and the bottom mounts have to be 2.8L not 4.3L. If your vehicle has a 4.3 you will have to remove those mounts and put 2.8 mounts on it. Both swaps have been done many of times and there should be way more then enough info online and on these forums explaining what should be needed.
I am not understanding how you are not finding any information on it. Makes no sense to me.