Header Bolt Torque/Sequence

[jwebb]

FFR 351W Headers and aluminum heads, recommendation for torque value & sequence?

[Jeff Kleiner]

I will generally start at the center then work outward alternating back and forth. You're going to find it impossible to get a torque wrench on them so just try to give them all a consistent "oomph" (that is a well know engineering spec). You need to go back through and snug them after a couple of heat cycles and if you're using locking bolts don't engage them until you've done so.

Jeff

[NAZ]

Ditto on Jeff's recommendation. However, I will add that unless your header bolts are zinc plated I recommend you use a zinc based antii-seize for aluminum heads. The zinc helps protect against galvanic corrosion so that when you need to remove them way down the road the aluminum is not corroded and you pull the aluminum threads out with the fasteners.

[Avalanche325]

You may also find that they are much easier to get to if you are under the car. You get a pretty clean shot at all of them. Of course there is the hassle of putting the car up on stands. Nothing is free.

[scottiec]

I use stubby wrenches. I will link two together for some leverage.

[PeteH]

Don't be surprised to find a few very loose after the first few heat cycles. It takes three or four cycles before tgey seem to stabilize.

[Joee]

I will generally start at the center then work outward alternating back and forth. You're going to find it impossible to get a torque wrench on them so just try to give them all a consistent "oomph" (that is a well know engineering spec). You need to go back through and snug them after a couple of heat cycles and if you're using locking bolts don't engage them until you've done so.

Jeff

the oomph is properly attained with a wrench that measures about 6 to 8 inches, not your 14" 1/2 in drive pry bar :)

[cgundermann]

the oomph is properly attained with a wrench that measures about 6 to 8 inches, not your 14" 1/2 in drive pry bar :)

That’s what she said.

Sorry, could not - not swing at that slow pitch.

[jwebb]

LOL Thanks guys!!!

[3yearplan]

"oomph" (that is a well know engineering spec)

Followed by the German engineering term "goodentight"..