Which 12v block to use? (casting numbers)

[kino_fab]

Getting ready to tare into Lynn's 2wd puller and wondering which block we should use on the build We have 3 block to choose from. The one in the truck is an IH casted block, one we have in the floor is suposedly a Brazillian casted block with 20C6 casted on the drivers side, and another block I have is a VE block that I belive is a 55 casting. Leaning more toward the IH block that is already in the truck, but would like to have the opinions of others first.

 

[Diehard Ram]

I think i would use the IH cast block. It should have the 14mm main bolts. Thats a good casting, if its a true 12v block. The others should all have 12mm main bolts. But all in all they all are good blocks. The 55 is a good casting, never had any problems with them. The brazillian block you speak of is more than likely a mexican block. Also very good and heavy. So it's really up to you want to use. All are very good!