We only use 25lb/ft on 3/8" x 24 x 4" headbolt bolting aluminum heads onto aluminum cylinders. I am looking to keep compressive strength (torque on the copper headgasket) as close to constant as I can. With this being an air cooled engine. There are load of heating and cooling cycles. I'm looking at 303 stainless since the torque is so low but have been told that 4140 is closer to aluminum in its expansion! Aluminum is much prettier though!
Any comments or advise will certainly be appreciated
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