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torque specs aluminum

  1. anwat

    torque specs for aluminum heads

    Installing new exhaust manifolds on aluminum heads. The torque specs I see say that a 3/8 grade 5 bolt can be torqued to 20 ft. lbs. and a grade 8 to 30 ft. lbs. So I torqued the bolts which are grade 8 to 20, and checked for leaks. I've got leaks along the whole gasket area for the last...
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