Header fitment rant, Doug's

yellow rose said
No one insulted you. There are guys on here who've been doing this a long, long time. I've never seen an engine mount that thick on a passenger car. Ever.

You're beating the crap out of your headers. You're getting new headers and have the same issue.

It's time to step back, take a breath and consider you have other issues.

Again, I wouldn't use any other mount than the moroso solid mount. Ever. As I say that,I'm kicking myself right square in the arse. You see, I have a 73 A body, which means I have the crappy 73 K member with the crappy 73 style engine mount.

When I rebuilt the engine and the entire front end, I looked and looked and looked and looked and couldn't find a 67-72 K member within a 10 hour drive or I would have went and picked it up.

Any rubber/poly mount, any of them is a giant compromise. Get rid of them. The moroso mounts are cheap. The car will drive better with the floppy rubber/poly mounts. And your headers will probably fit.

I'll find a 67-72 K member one of these days. When I do, I'll snatch that up, order some moroso mounts and finally be happy.

So no one is insulting you. We are trying to help, and you are trying not to listen.

The 73+ spool mounts are a much better design than the biscuit mounts. Which is why they replaced the biscuit mount design. There are ways around the failures you get with the biscuit style mounts separating, like solid mounts, but they’re band aids. Solid mounts on a street car can get annoying with the additional vibration they transmit.

I run poly inserts in the spool mount K I have in my ‘74, they work great. What compromise is there? They fit well and locate the engine properly, and if the mount wears out you just replace the insert. And the engine can’t walk out of the mount like with a failed rubber biscuit mount. Plus you get the better design of the 73+ sway bar as well. Improved ground and tire clearance compared to the 67-72 design.

MOA said
YR, Fair enough. I've read everything and looked at everything suggested, the motor being centered probably most important. The height of the motor mounts, I don't think that's it but it's possible, at this point anything is possible.
For those that had no problems, how close to the oil pan is the #3 header tube?

I run a Milodon road race pan with a large kick out and I still have room to #3.

The engine mounts you have are not putting the engine in it’s original location. That 100% changes the header clearance.