Intake Torque #'s

[95GTV8]

Allright, im doing a manifold swap in 6 days and i got some Q's, 1st off can anybody provide me of an img for the bolt torquing order for the lower to cylinder heads, and for the upper to lower. Also i need some torque numbers i've heard:

Torque in 3 steps: 8 - 15 - 25

Re torque after running the engine.

is sufficient for the lower intake, but i don't want to overtorque anything and crack the manifold, and also what torque sequence/torque numbers for the upper to lower? thank you, any help is much appreciated.

 

[Grn92LX]

I go 22 ft/lbs on the lower. Use a little antiseize or oil on the threads. Go over the sequence until all bolts are 22 ft/lbs. 3 times ain't gonna cut it.

 

[mo_dingo]

Allright, im doing a manifold swap in 6 days and i got some Q's, 1st off can anybody provide me of an img for the bolt torquing order for the lower to cylinder heads, and for the upper to lower. Also i need some torque numbers i've heard:

Torque in 3 steps: 8 - 15 - 25

Re torque after running the engine.

is sufficient for the lower intake, but i don't want to overtorque anything and crack the manifold, and also what torque sequence/torque numbers for the upper to lower? thank you, any help is much appreciated.

Yup, those numbers are right. They are usually listed as 96 in.lbs, 15 ft.lbs then 25 ft.lbs. Most ft.lb torque wrenches won't go that low, so you usually need a in.lb torque wrench.

The sequence is listed in the haynes manual for our car. If you don't have one, you need one. Also, the sequence is posted on the FAQ at the top of the page in the intake manifold installation section. And he is right, when you get to the 25 ft.lb stage, you will have to go over it many times to get it so all bolts are at 25. When you tighten one bolt down, it pulls the intake down all around, and that makes the previous torque setting null. So that is why it's important to follow the bolt sequence.

The upper needs to be torqued to 20 ft.lbs. Good luck getting a socket/ratchet on the outer/inner bolts. Don't worry about it. Get then flush, then turn 1/4 turn past that.

 

[legalize420]

get the bible ( haynes ). i got one a few weeks ago and it will answer pretty much any question you can think of.

 

[bimmertech]

i don't torque upper or lower bolts. most manufacterers of aftermarket alum heads don't reccomend torqueing either. just tight with a ratchet. sequence is important though.

 

[Zero Signal]

The upper plenum doesn't hold any fluid so it's not as crucial. And like Scott said, you really need to have a ft-lb AND an in-lb wrench since the ft-lb wrench looses all it's accuracy below 30 ish ft-lbs.