Aluminum intake bolt torque

[417guy]

Changing my intake to a performer rpm on my 68 383 roadrunner. FSM torque is for a cast iron intake . My heads are still 906 cast iron. Since the intake is aluminum should the torque of the bolts be less ? The same as FSM ? Thoughts ?? Thanks to everyone for advice !

 

[Aron Gleason]

They don't need much torque, about 30 inch pounds.

 

[pnora]

Changing my intake to a performer rpm on my 68 383 roadrunner. FSM torque is for a cast iron intake . My heads are still 906 cast iron. Since the intake is aluminum should the torque of the bolts be less ? The same as FSM ? Thoughts ?? Thanks to everyone for advice !

Edelbrock says 25 foot pounds.

 

[pnora]

They don't need much torque, about 30 inch pounds.

No.

 

[417guy]

No.

Not sure that’s enough. Maybe for the valve covers ???

Edelbrock says 25 foot pounds.

25 foot pounds sounds right ! Thanks !

 

[Bird 426]

I would also retorque them after a cycle or two.

 

[dvw]

They don't need much torque, about 30 inch pounds.

Where did this spec come from? Even a trans pan gasket is 100in/lb. I usually use about 30ft/lb.
Doug

 

[hunt2elk]

I have always been told and used 25 ft. lbs. as well.

 

[AR67GTX]

I’ve run into this with a big block Chevy where aluminum intakes are known for cracked and broken bolt holes and warped gasket surfaces. Need to be sure the surfaces are flat and mate well and back off the torque specs for the cast iron manifold bolt torques by at least 5 ft lbs - probably more like 7 or 8. But Mopar aluminum intakes may be more forgiving - I don‘t have one except a Hemi and it’s a bit different anyway.

 

[33 IMP]

Tight as I can reasonably get them, with a short wrench. I can't get a torque wrench on about half the bolts on my intakes. (I compare the wrench pull on the ones I can't get, to the ones I have torqued with a torque wrench)
And 30 INCH- pounds is about 2 1/2 FOOT pounds, about finger tight. I don't think that's enough.....

 

[Geoff 2]

What Edel says: 25 ft/lbs.

 

[beanhead]

Here's the instruction sheet for future reference...

 

[417guy]

Here's the instruction sheet for future reference...

View attachment 1590048

Thanks for the diagram ! Appreciate it !