For people who have installed an intake manifold, do you always replace the bolts?
The manual says to replace the bolts anytime the intake manifold is removed. I thought that sounded silly, but then a bolt snapped at relatively low torque when I put the intake manifold back on. The bolts thread into the block itself, rather than mount on studs like the exhaust manifold and the torque is way lower for the intake (18.9) than for the exhaust (69 if I remember correctly).
That begs the question; Are the intake manifold bolts the equivalent of a fuse and meant to break before you can hurt your block? If that is the case, are they all suspect and should be replaced since they have already been torqued twice going on and off, and therefore may be weakened and prone to failure?
The manual says to replace the bolts anytime the intake manifold is removed. I thought that sounded silly, but then a bolt snapped at relatively low torque when I put the intake manifold back on. The bolts thread into the block itself, rather than mount on studs like the exhaust manifold and the torque is way lower for the intake (18.9) than for the exhaust (69 if I remember correctly).
That begs the question; Are the intake manifold bolts the equivalent of a fuse and meant to break before you can hurt your block? If that is the case, are they all suspect and should be replaced since they have already been torqued twice going on and off, and therefore may be weakened and prone to failure?
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