Matt Hunt responded to: >> whats the thickness of the Nissan motor sports turbo head gasket >> for the sr20det? thanks for the help. with: >87.5mm I believe. With a head gasket that thick, I think you might not only be concerned with dropping your compression ratio, but your cylinder head might hit your hood. (87.5mm is 3.5".) Maybe you meant .875mm? :-) Tim Rogers