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I'm not sure about motor mounts, but I did get new isolators and a transmission mount to install. I did have a broken exhaust hanger on the passenger side, but now I need to investigate driver side. I feel like the passenger side has the longer run from engine to first hanger, but the driver side has a hanger upstream of the y pipe, as I recall. But yeah, sure does seem like a lot of bad luck on my end.You sure you don't have a broken motor mount or missing exhaust hanger? That's kind of an odd place for them to crack - most just crack right around the flange where it bolts to the head.
At that point I was 3 days in and had already spent hundreds of dollars in unplanned tools to get the old nuts/studs out, taken up much of my wife's weekend in having her help me hold up the 24" long string of extensions/joints while I torqued it down, and more or less gave up on getting it done perfectly .I had the same issue, but I removed my motor mounts to get the nut on. I was too nervous that after a few heat cycles a leak could develop.
may be the smoking gun for my manifold failure issues... if block is sitting a scosh lower maybe that's the added strain on the system. . . . . .Oh wow! Those original mounts were pretty compressed!
Something else to add to the to-do list, I guess.