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[bmw] e30 head gasket

What is the purose of the thicker head gasket after having the head 
resurfaced? A used head was resurfaced to maximum spec for use on a 
rebuilt m20b25 (325i) with a 276 degree by 10.2 mm lift cam, overbored 
stock pistons. The machinist pointed out that there is an optimal 
clearance between the piston dome and the head which will facilitate 
combustion by squeezing the mixture into the area around the sparkplug. 
The question is will the piston be too close to the valves and head with 
the standard gasket?  I don't want to decrease the compression with the 
thicker gasket.

Greg with a project too
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