Internals from my LT1
Im not even considering motor parts for another 20-30K.
You must have bought a " well used " Z thats hasn't seen some new parts yet
Crank bearings, pushrods, lifters , all motor seals....etc
But if youre gonna rebuild the whole motor, might as well put in some better parts.
Better crank, better cam, better rockers, forged pistons... etc

