soundhd
Well-Known Member
Just purchased a copper exhaust manifold gasket kit for my 70 Roadrunner (stock 383 auto).
What size are the "stock" exhaust manifold bolts (not studs) (insturctions list 5/16"-18 or 3/8"-16).
Torgue settings for both sizes of bolts on the instructions are different using Oil or Moly...what do they mean by Oil or Moly?
Torque setting on instructions are: (ok to use?)
Grade #5: 5/16"-18: with Oil - 96 inch lbs.;
Grade #8: 5/16" 18: : Oil - 20 ft. lbs. ; Moly 13 ft. lbs.
Grade #5; 3/8"-16: Grade #5: Oil - 15 ft. lbs.
Grade #8: 3/8"-16: Grade #8: Oil - 35 ft. lbs.; Moly 23 ft. lbs.
Also is it OK to re-use the old bolts or should I purchase new ones? If purchase new ones what type should I get..Grade 5 or 8? (assume #8 is best)
Want to make sure I do this right the first time.
thanks
What size are the "stock" exhaust manifold bolts (not studs) (insturctions list 5/16"-18 or 3/8"-16).
Torgue settings for both sizes of bolts on the instructions are different using Oil or Moly...what do they mean by Oil or Moly?
Torque setting on instructions are: (ok to use?)
Grade #5: 5/16"-18: with Oil - 96 inch lbs.;
Grade #8: 5/16" 18: : Oil - 20 ft. lbs. ; Moly 13 ft. lbs.
Grade #5; 3/8"-16: Grade #5: Oil - 15 ft. lbs.
Grade #8: 3/8"-16: Grade #8: Oil - 35 ft. lbs.; Moly 23 ft. lbs.
Also is it OK to re-use the old bolts or should I purchase new ones? If purchase new ones what type should I get..Grade 5 or 8? (assume #8 is best)
Want to make sure I do this right the first time.
thanks
Last edited: