quote:we (as do many others) flipped the bolts so they go down through the mounts, nut bottom. The theory being if a nut ever comes off the bolt stays in place rather than drop out.
On our '72 L, the long bolts were drilled on their bottoms for a cotter pin apparently to retain the nut if/when things loosen, but getting it into the bolt's hole is tricky. I substituted a loop-pin and used a long pair of needle-nose pliers, but it was still not simple.
What happens is, over time the rubber shrinks, loosening what torque there is on the long bolt. It's especially bad on the left side from header heat.