Need help identifying EA82 blocks/pistons

[subdubscoot]

Hello all,

 

I'm trying to rebuild/replace my EA82T and have read on here that the blocks are the same.  Hence, some confusion.  Below are some pictures.

 

First, a picture of the EA82T block from my 86 GL10:

 

 

Second, a picture of the block from an 87 XT (non turbo MPFI) engine I bought from a junkyard

 

 

What is the extra cavity for in the GL10 block?  What can I get away with?

 

Third, a picture of one of the pistons from the 87 XT engine.  I has been bored 0.5mm over.  But this looks like an "interference" design to me and I thought all EA82's were non-interference?  Does anyone recognize what these pistons are from?

 

 

thanks much for looking and providing some help.  I hope these pics can be enlarged somehow at least when viewing....

[Caboobaroo]

The extra cavity on the back of the turbo block is a crank case breather. My ER27 has the same one. Having run a nonturbo block in an EA82T setup, not ideal to run without. It can cause blow by and other ring/land issues.

 

The piston appears to be a SPFI piston or possibly an EA81 piston. The MPFI pistons had a slight valve relief in them, the carbed had a bit more relief and the turbo has a dish.

 

It's been awhile since I've played with an EA82T as I've moved on to bigger engines.

[subdubscoot]

Thanks.

 

I'm actually planning to ditch the turbo and need to decide which block to use.

 

The 86 GL block has been decked enough that I will have to use HG shims.