I have a bad oil leak in the back of my engine. I dropped the car off this morning to have the trans rebuilt and the guy told me if the engine has a one piece rear main, he will replace it for free.
The casting on the block is 3970010. Does anyone know if this casting has one piece rear main or two. Any help would be great, thanks in advance..

 

if its an 86 probably 1 piece, but I thought they switched over to 1 piece rms in 1988..... double check that.

 

2 peice rear main. It could be a 2 or 4 bolt block. The only way to know is to take off the oil pan. These blocks are high nickel content, and are good castings.

 

The block didnt come with the car. The roc had a 305 at birth and I have no way of knowing what year the block is. It's probably a two piece considering I could have it done for free if it is a one piece!

 

what doc said, 010 block has a 2 pc rms

 

thanks guys. the really bad thing is i had this engine on my engine stand back in march.. it would have been so simple to do then.

 

The 1 piece RMS started in 1986.