How can you tell what block # my 98.5 3500 has and where do the 53 crack at? What causes them to crack I read some where that towing heavy loads causes it My dad tows a 16,500 lb. camper with his 01 2500 I thought this is what these trucks were for!

 

Just do a search for "53 block" and you'll get lots of info with pictures. This site is great...