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Question about my new head
Posted: Thu Jul 08, 2021 1:35 pm
by MaxwellMiky
I have a 1989 325i (M20B25) that is getting a new head because the last one bent all the valves. I have a buddy with a head off another M20 that ran perfect before it was pulled, motor was pulled for an S52 swap. My question is if i get it all cleaned up and check it with a straight edge for any imperfections in warpage and all that and it passes should i still go get it resufaced? Or is that not needed? im asking bc th
Re: Question about my new head
Posted: Thu Jul 08, 2021 6:49 pm
by steve_k
it's best to get it skimmed just to be sure & on the safe side, the 885 head is getting rare now.
Re: Question about my new head
Posted: Fri Jul 09, 2021 10:45 am
by flybynite
As above I would get it looked at and checked properly. A clean up skim is a good idea but it depends on how much has been taken off before. There are divots on the head that should still be showing otherwise you may get valve clearance problems especially if it is not a standard cam. You may not have the depth to loose.
Pressure test is a good idea on 885 heads before you waste time on the swap.
Have you thought of a new AMC head?