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Thread: How many head shims on OS V-spec .21
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Old 06-05-2009, 11:53 AM
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hambone
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Originally Posted by lauri
Hi,

What is the default/stock head shim amount? Is it 0.2mm (one thick alu shim)? I got my engine new but not in a box and so I don't know if the extra shim there already one too many. At the moment I have 0.2mm alu + 0.1mm copper + 0.1mm copper. Seems a lot to me. The engine is now broken in so its time to get the maximum performance out if it.

I'm in a hurry and can't find an answer from anywhere. Thank you for quick answers. Couldn't find it from search or the user manual.
The xtra .004 shim (i'm american) is recommended by OS if you run 30% nitro. Not needed at all.
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