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Thake it to a good machinist and have him check it and make sure that it is perfectly flat.

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you want it good the 1st time. the intake bolts are numbered 10-6-2-4-7-11 front to rear on the pass side. 9-5-1-3-8-2 on the drivers side front to rear. torque bolts 1 thru 4 in 12 INCH lb increments to 72 INCH lbs then the remaining bolts (5-12) to 72 INCH lbs (in order). Check that ALL are at 72 INCH lbs by (re)torquing them in order, then torque ALL to 144 INCH lbs in sequence & recheck all of them in order for 144 INCH lbs.