Im just finishing up my head gasket/timing cover gasket exploration ( or so I thought) on my 2001 disco and have an extra bolt that is 1/2" x 1" long. Its the same type of bolt as the ground strap and wire harness on the rear of the drivers side head. Did I miss a wire harness on the pass. side?

 

Take a picture and post it.

Second......there is no 1/2" bolt on these cars. You are probably looking at a M12 bolt.

Like I said.....take a pic and post it. Someone will recognize it, I'am sure.

 

Technically its a 3/8-16 x 1 bolt (1/2" head). Most of the bolts in the block and heads are SAE because its based off of 60's Buick 215 block. I can get a pic tomorrow but its just a hex washer bolt.

 

My money says it's the bolt that holds down the coil pack.

Just a guess, but that is where my "extra" bolt was from.