i have 2 340 motors and i dont know which one to use.both are bare blocks to start out with.one is bored 60 over and the other is 30 over.i would like to use the 60 over block just becuse i have pistons for it already.has anyone ever had any overheating problems with a 60 over block?compression is 10.5 to 1 with x heads and manifolds.any information would be great,thanks,mike
