Engine Block: Same or Different?

[MOMule]

Other than the bore, are the 3000 Diesel and 4000 Diesel blocks the same? Wanting to know if I buy a good used 3000 Diesel Block if it can be turned into a 201. Local dealers think they are different because the part # is different but admitted they were not sure. I am wondering if the part # is different because the bore is different. Thank you for any information you can provide me.

 

[Bern]

I've heard of people boring 4.2" blocks out to 4.4", but I gotta think that's not very wise. There's no way those two blocks were cast with the same wall thickness.

 

[Welding man]

Knowing how many of the 4.4 blocks that I have had to have rebored and sleeved back to standard due to cavitation problems, I wouldn't think about it. I have had a couple of 3000 blocks bored but not that much. Some really good machine shops are set up to ultrasonic test blocks and could determine the wall thickness.

 

[Sean in PA]

The sleeves for the 3000 block are only 4.32 O.D, so the manufacturer didn't even want you boring that block all the way to 4.4" just to sleeve it.

 

[Ultradog MN]

I have a couple of 4000 blocks here if you need one.

 

[MOMule]

Thank you for the replies. I will not go with the 3000 block but am having the 4000 block bored and sleeved back to standard. Thank you.