Intake manifold torque

93ragtop said

Honestly, I dont see how 12ft lbs could stretch a 5/16 bolt of any grade, let alone a grade 5.
As far as I can tell, Aluminum is the only available intake for a magnun bolt pattern....
I agree, DionR is on the money, same as FSM
Never really though about sealer for the bolts.

Thanks for your post.

Click to expand...

Aren't factory bolts TTY? They stretch by design.

Also, as you've probably sean or heard about, too much torque on a magnum intake can crack a block so the legend goes. Doesn't take much force on a magnum due to the angle of the bolts to seal it up. Don't gorilla arm it...

Regardless, we did ours per the 12fp you did and it's still running fine, no leaks. Possible your torque wrench is out of whack? If you're using a FP TW, instead of a IP TW, the torque will be suspect.

Just thinking out loud.