I have an 84 350 with a 460. I was wondering if there are any problems with the useing the block heaters. I know early 6.9s would crack around the heater just wondered 460s had the same problems.

 

I've never heard of a 460 cracking from one but then again one never knows. My 351M has had the block heater in it at one time and it came from MI so I am sure it was used and the block is fine. It was to rusty to reuse so I installed a normal freeze plug. The 460 block is a much stronger block than the 351M/400 blocks.