M50 block to far gone.

[Noodle1]

Hi, just after a bit of advise on a M50B25 block i am using for a B30 conversion.
I took the block to the local machine shop this morning and was told the bores would need a considerate amount taken off (so much for a re-hone!) this isnt an option as i already have the standard size piston + rings from the m54 so my next thought was, are the M50 B20/25 blocks as interchangable as the M20 blocks ? Can i rebore a 2ltr block and have all the oil/water ways match the 2.5 head. I did a qick google but couldnt come up with anythig conclusive,doesnt appear to be the most talked about subject.

Thanks in advance

[wullie325i]

in theory i would say yes as they are in essence the same engine but i havent done it so couldnt say for sure as no doubt there will be some difference somewhere.

[Noodle1]

in theory i would say yes as they are in essence the same engine but i havent done it so couldnt say for sure as no doubt there will be some difference somewhere.

lol, cheers Wullie looks like this will be of some interest to both of us then

[Noodle1]

So it turns out the head bolts/gasket and bearing shells are the same so they should fit, just the block height in relation to the pistons. . . . . .

[DanThe]

AFAIK the only difference is the bore diameter, ive got a 2 litre block I saved from a scrap engine, no B25 gasket to check it though

[Noodle1]

No worries Dan, from what i can tell i think its just the thickness thats different ?
Gonna grab the old gasket and hope the local scrappy still have a B20 kicking about.