Quote Originally Posted by madgrinder
The LT-1 oil-routing is different... so a different crank is needed. The LT-1 counterbalances and rod weights are different. LT-1 crank must have LT-1 rods... the reason for the price difference is supply and demand.
Here is some info i found on the Cranks.

"CRANKS

350 - The crank for the LT1 looks just like the one in the late 350 and has the same casting number 14088526, but it’s balanced for the lightweight pistons that were installed in the LT1. Be sure to keep these cranks separate so they don’t end up in a regular 350, and don’t ever use a regular 350 crank in a LT1. In fact, if you are short of LT1 cranks and don’t have a balancing machine in your shop, you would be better off using a crank from a 305 instead of a 350 because it’s actually closer to the balance specs for the LT1 crank."