i have a lg4 in my berlinetta....yay.the motor sucks.....it knocks at certain throttle positions....u think if i took the l98 heads off of my parts car..and stuck them on my lg4 it would run better?....the l98 car has only 63,000 miles on it and everything looks almost brand new....but...u think it would help my lg4.....the l98 was flipped leaving me to beleive id need to rebuild it....what do u guys think???

Dan......

 

The LG4 is a 305? If so, you'll lose compression ratio, you may make up some in the better flowing L98 heads.

For all the work to pull two sets of heads and install another, I think I'd pull the L98 from the parts car, pull the pan and have a look at the bearings, if they're okay, then install that motor.

Car's don't run too long when upside down, a few minutes at most, and probably at an idle RPM speed, probably enough oil still on the bearings and enough left in the pump to keep things from getting trashed.