will m50tub25 head fit on b28 bottom end??

[e30sequel]

I am looking at 2 engines - the obd1 2.5 is running and the 2.8 apparently has a blown head gasket .....

my question is whether the 2.5 head will be a direct fit onto the 2.8 bottom end (which I am assuming is intact?!?)

I have looked into it and although it seems like it is feasible, there is no concrete answer as to direct fitment ..... any knowledge appreciated

[frankie591]

I know they will fit. I do not know if the compression ratio will change.

[surebimmer]

Yes they will fit. Check the casting numbers on the head. What are you trying to do? Is one head cracked?

[e30sequel]

Hi thank you for the reply....
One of them will end up in a 91 318i with the 240 tranny - but I would rather have an obd1 2.8 (it is unfortunate that the situation is not reversed) - this would then go into the e30 with at least a refreshed head gasket, guides etc

tuning of the ecu would probably be in the cards but once I do the exhaust, the budget would come to a screeching halt = it has to work as is for a month or so ....

thats the whole story but this is standing in the way, so again, take the entire head, fuel rail and whetever else (please confirm what else i could take from the b25 top) and transfer onto the 2.8 bottom....?!?! yay or nay or what is the solution?

help appreciated

[FredK]

So you plan on running this as OBD-II and keeping the M52 electronics?