A quiz for you gear heads. See the attached photo. I rebuilt my sons 03 4.0 sohc motor. Every bolt in the motor is accounted for. Re-installed the motor and everything works. All during the install I was looking for where this bolt went and there was no place. This, to my surprise and luck was the only remaining bolt. All the transmission bolts are in, all the mount bracket bolts (alternator, air, etc) are in and I still have this bolt. Its a 10 x 1.25 thread, OAL is 40mm, the shoulder (about 12mm dia.) is 20mm long. The head is a 13mm hex. The head has the stamp MR and below it is 9.8. I read this as a grade 9.8 (ISO) - which is every bit a grade 8 bolt. This is an impressive bolt. The shoulder appears to function as an alignment dowel (could certainly take a very high shear force). The bolt is black oxide treated, is not rusted, shows no indication of exterior exposure to water, mud, oil etc. In fact, I took a Kleenex to it to analyse any deposits - there were none - the bolt was clean (even in the threads). But under magnification the head looks like it was torqued tight once, and loosened once. Come on you guys - show your stuff - where does it go? I'm expecting some woman to step in and kick your butts.