Jump to latest follow. For example i got the arp head studs and only torqued my heads down to 115 lbsft with moly lube.
Torque On Header Bolts With Aluminum Heads Ford Mustang Forums
Header bolt torque aluminum heads. Some people do only 1 or 2 steps to reach the final torque. Discussion starter1mar 10 2005. On each head bolt to make sure none have been missed and that the bolts are retaining torque normally. Main cap bolt 396 454 4 bolt inner and outer 110 ft lbs. Screw in rocker arm studs. I use the small head stainless arp header bolts and because of the configuration.
Use a straight edge and check for flat. Cylinder head bolts long. I blew an exhaust gasket and decided to fix the whole enchilada correctly. You need to follow the instructions that came with the bolts. Moly and other lubes offer reduced friction and increased bolt tension which will affect the torque figure. Intake manifold bolts cast iron head.
Hey i thought i would share a recent experience and some tidbits that i searchedalmostendlessly for. Tightening header bolts into aluminum heads. If there are gaps or warpage have a machine shop mill the mating surface flat. These specs are for stock type bolts with light engine oil applied to the threads and the underside of the bolt head. I have an aluminum head zz4 in my 68 and recently lost a header bolt. Main cap bolt 396 427 2 bolt 95 ft lbs.
Yes your torque specs will be different with aluminum heads than cast. Cylinder head bolts short. For head studs or aftermarket bolts check your instructions sbc studs are available in a ton of different styles depending on heads and stud diameters. Aluminum has a higher coefficient of expansion than cast iron. If a bolt is not coming up to normal torque or is not holding a reading it means trouble. It will take only a modest amount of torque to seal the header anyway.
Gallery of Header Bolt Torque Aluminum Heads
