If you're inclined to ignore the directions of the manufacturer of the fastener then at least look up and follow the industry specs for said fastener when used with those same materials. I believe the spec for the MKIII headbolt size is about or just under 80ft lbs for an elastic application... then you allow for the expansion of the materials it is joining as the engine heat cycles (remember, aluminum expands more rapidly than steel) putting us back down to about 75. It's not just about what the fastener can withstand either, these heads are not as beefy as people seem to think and they're not the best alloy available today. They've got well over 20 years of stress making things even worse. These same rules apply to studs.
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