MAXIMUM Header Gasket Thickness?

Summit Copper exhaust gaskets.

I am using one on my drivers side, under the stock
exhaust manifolds, beacuse I had a minor exhaust leak.
with the 318. :)

http://store.summitracing.com/partdetail.asp?autofilter=1&part=SUM-111420&N=700+115&autoview=sku