Quoted post[/post]]
No, you can't fit B-series pistons in a D-series block, no matter what. According to GE, the biggest you can bore and/or sleeve a D-series block to is either 78 or 79mm(can't remember which, but it's irrelevant here). Because a stock B-series piston is 81mm, you simply CANNOT put B-series pistons in a D-series block.
Period. End of story.