Went out to play with it little today. I did notice all the 6 point bolts say "ARP" in the head. These two 12 points say "DB" in the head? I got the easier to access one out with the 12 point wrench/socket combo. If this this was a 1/16 longer it would not have come out because it was wedged up against the runner. The front one is much worse, I have no idea how that one is going to get past the runner unless it is a shorter bolt.
First I put a 1 foot long 7/8 wrench on the end to gain leverage. That did not work. Then I tried a 2 foot long pipe, that worked but cracked the socket ear where the pin goes thru. There was some
oil on the bolt when I took it out. For ref, this is the 4th bolt back from the front, PASS side. It measures 2 3/16 from bottom of flange to the very end of the bolt threads. Also, all the other manifold bolts have a built in flange under the head. I did not try and take out the front bolt because of the socket issue. This bolt is the 2nd one from the front, do you think it would be the same length? It seems to sit a little lower in the manifold.
I will post a few pics.
Believe it or not, the local nutty bolt company has black 6 point with a built in flange. they also have stud, fully threaded only. They have black nuts too, but only with the built in washer. All of the bolts, studs, and nuts are grade 8.
Dave