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Check with the head manufactures recomended torque,some aluminium heads don't want to exceed 70/75# and others 80/85#.Most high torque specs are for iron heads.

Good to know ( and check ), although the paper work I got with my ARP studs did not discriminate between iron and aluminum heads. If you can't clamp with higher numbers than with regular head bolts, studs are kind of a waste - unless you take the heads off and on - often.

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