320 head on 325i engine

Post Mon Jun 11, 2012 6:40 pm

Ok I was told today that a 320 head is the same as a 325i head?
They can't be the same can they?

Post Mon Jun 11, 2012 6:43 pm

totally different castings won't fit/work

Post Mon Jun 11, 2012 6:46 pm

who ever told you that is a dick

Post Mon Jun 11, 2012 6:52 pm

Cheers new they couldn't be the same.

Post Mon Jun 11, 2012 6:53 pm

Cheers new they couldn't be the same.

Post Mon Jun 11, 2012 8:18 pm

Won't work standard as the squishbands don't match. The squishband can be modified to work however its not worth doing unless you have a very good reason to.
If you want a new head for a 325 then you want the 885 casting.

Post Tue Jun 12, 2012 3:29 am

Ihave always wondered how a 731 head with modified chamber would go on a B25.........the discharge coefficient based on min CSA is better on the 731 than the 885 but it is physically smaller so absolute flow is lower

Post Wed Jun 20, 2012 5:07 am

Yes it will, the 731 head i have to test is a head that was on a 320 i had and was then pressed into service on a b25 by a friend in order to get a 325 touring belonging to his boss's dad up and running as a daily smoke.

In order to get it working the head required the squish bands cutting back to match the angle squish on the 885.

Will post a few findings from the last couple of weeks on my stroker thread rather than bring this OT.