how many differant variations are there ?? I know all about the 53 block but i have also heard of a 55 block and then a block with no numbers at all ??? the 53 block are common in what years ?? Thanks

 

Not sure on how many variations there are, but usually the block number refers to where it was cast.

53 block was found in 24 valve engines from 99 to mid 2001ish.

55 block is good, as is the one without numbers.

I think the 53 and 55 were cast in Mexico?
No number one Brazil perhaps?


phox

 

1. Brazilian Blocks are cast by a company named "TUPY" and are marked such. They are identified with cast evolution numbers. #53's are TUPY's. #54 and later evolutions were improved to correct the block issues that the 53's had.
2. Mexican Blocks were made by "Teksid" these blocks to my knowledge never had a problem with cracking, as they are heavier duty by trait, but they did follow the evolutions and got thicker. These blocks do not have the 2 digit "cast number" embossed on the side, instead a series of numbers that are unidentifiable to me. The Mexican blocks were rumored to even be harder to machine do to a harder cast overall, basically better quality in my opinion.

Brazilian Tupys always seem to outnumber Mexican blocks during the ISB's production probably about 8 to 1. So basically if there is a pattern number its Brazilian, if there is a series of small numbers its Mexican.

By the way the Mexican equivalent of a 56 pattern was the Heaviest ISB block of all. This means if you have a 2002 without a #56 on it and instead it has a series of numbers that are smaller and hard to identify, you got the the big boy!!!



Thats direct from Cumminsdatabase.com if you want to read up more

 

could you get a big boy block in 2001 ?? my 01 has the group of 6 or 8 numbers on the 2 spots that the 53 usually appears ?? Thanks

 

Yes, if you don't have the 53 or 55, then you have the good one.


phox

 

I forget where to look for the casting numbers. A friend was over last week and we both looked on both trucks and didn't find them.