I recently did a full rebuild on my 74 LS4 Vette Roadster. I installed standard Autozone motor mounts. Now when I really ROMP it, I am hearing a buzzing sound that lasts through the main power band rpm.
I am pretty sure it is the torque pulling hard right and the fan is momentarily rubbing on the plastic fan shroud. I have discovered a small "cut" in the shroud about where the fan would hit.
Suggestions on motor mounts?....hard neoprene?.....GM?