If that side was the easy side I may shoot myself, took me 8 hours to get the passenger side on. I had 7 bolts started Sunday night and dropped the 8th which was the underneath next to the rear hole. The bolt fell down between the tubes and I couldn't get it out. Monday morning after a trip to Harbor Freight buying some things I needed I made a tool out of the two I bought and got the bolt out. From noon yesterday, breaking only to eat I finally got all 8 in and tight. The issue was that I couldn't get that one bolt to thread in with my fingers, using a wrench the bolt wouldn't thread easy feeling like it wanted to cross thread. So a took the header off 3 times running a tap in the hole and running bolts in the holes to chase the threads cleaning the hole each time. By 8 last night I took a break to eat and my hands were shaking I was so pissed, I drank a beer and calmed down bit and went back to the shop looking at the header on the floor. I had Jet Hot coat these headers so I ran a drill in that hole and touched the opening up a bit and tried it again. That time the bolt grabbed the threads and I could turn it by hand until I felt confident using a wrench to run it up tight, I finished getting all 8 tight by 9:30 PM, and then sat there contemplating how in the hell it took me so long do do what I just did.
So if the other side is harder either the car or me is going to get shot!!
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