*The Infamous 53 Block

Special Thanks to Stamey's Website for this FAQ about the 53 Block


53 Block
DM

[Dr. Evil]

Im lucky enough to have my 53 featured on Stamey's page...

[KATOOM]

Good info, but after all the reading on #53 blocks I have done I have come to the conclusion that there has to be more #53 casting molds than everyone thinks. Otherwise then whats the reason that the casting numbers can be found in more then one location, depending on the block? For instance the big 53 is usually found here but it may be found there, too. That has to be a clue why some guys with the #53 block have trouble with cracking and others can tow heavy and modify their motors with no cracking. There has also been some question as to the quality of some casts. Some look really bad around where the cracks form and others look clean. Not sure but I dont think that all #53's are the same.

[dozer12216]

yes, there are several 53 castings over a period of years. believe the problem can occur with many of the blocks. it has to do with core (sand mold) shift and variations. If it is shifted slightlly to say the "+" side it NEVER fails. If the shift is to "-" side at the extreme it failes within a year or less. If inbetween it varies depending on operating conditions and luck. IF core is in neutral position the likely hood of failing is very small but possible. The futher toward the "-" the more likely some 53 castings will fail. The number that actually fail, no one knows for sure. My SWAG is less than 10% and probablly 2% or ever less than 1%. Remember this block is used in other applications world wide, but MOST probablly wound up in a Dodge. I did see a measuring procedure for evulating potential block failure but no longer have ideal where was seen. The core plugs had to be removed.