Thread: Exhaust header outlet to reducer gaskets.

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Originally Posted by 34_40

What did you torque them to in the past?
a 3/8" fastener I would've assumed to be in the 30 to 35 ft lb range, so the values you posted seem low to me.

I don't remember. It's been quite a while ago. However, the heads are aluminum, and 30-35 seems more than a bit high. I found another recommendation, this one from the GM Performance Center that says 11 ft-lbs on the first pass then 18 ft-lbs on the second pass for ZZ4 and similar aluminum heads.