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Head Gasket Thickness Recommendations


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Need some feedback on which size head gasket to use for my rebuild.  Machinist recommended the thicker of the two gaskets.  Also, any thoughts to what extent degreeing of the Cam I’ll need.  
 
- Head is an E12 with 9.5 89.5 piano top pistons
 
- Cam is a 284. 
 
- Block was decked .005 from original dimensions
 
- Head was shaved .010 from it's original size
 
- With a new 1.8mm head gasket slightly tightened down I get a reading of 1.6mm of distance between the intake valve and the piano tops.  Valves were set at .010.  I don't have an old 1.5mm gasket to use.  Is the thicker gasket too much for this build?  Thinking so.
 
Thanks 
Murph

 

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The Metal gaskets (MLM) can be ordered custom, with custom thicknesses.  Ireland has them, they take a while to order.  Ask your machinist what thickness you should get.  I suspect you would start with a +.015.  The cam isn't that wild. Playdough is your friend in the end, that will tell you how close you are. You can get an adjustable cam gear while you are there. 

 

 

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"Goosed" 1975 BMW 2002

 

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3 hours ago, MurphinDC said:

Head was shaved .010 from it's original size

Which was? I'm asking for the  current, measured  thickness of the cylinder head.

76 2002 Survivor

71 2002 Franzi

85 318i  Doris

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Posted (edited)
13 hours ago, tech71 said:

Which was? I'm asking for the  current, measured  thickness of the cylinder head.

The current thickness of the head is 128.75mm.  In the meantime, this morning I found a fresh Glaser 1.5mm head gasket in my parts stash and took some valve clearance measurements with the head tightened down slightly (one 1/3 turn snug) and using playdoh as I did before.  This confirmed I need the thicker gasket as my intake valve left just a very thin layer (it was almost see through) of playdoh, while the exhaust side had sufficient room.

 

Thanks

Murph

Edited by MurphinDC
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