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Old 03-27-2020, 09:51 AM   #2
40 Deluxe
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Join Date: May 2010
Location: now Kuna, Idaho
Posts: 3,386
Default Re: bolt torque difference iron block & Aluminum Head

As I remember, those are 5/16" bolts so the bolt itself is the limiting factor. 12-15 ft. lbs. should be OK in aluminum as spark plugs in aluminum heads are torqued to around 20 ft. lbs.
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