I have aluminum brackets through bolted to the stringers with large backing plates. The rubber mount then bolts to that. My rubber mounts are crappy. I was going to replace them with these billet pieces. That way they would be ridged but remain adjustable.

NO he deleted those threads.

That is a nice piece there. And for your application will be great. The only thing I would do is go to McMaster Carr and order Nylock nuts to replace those nuts so they wont loosen up. Just a little insurance.

Good Call. Or a dab of loctite.

Yup you were right it was another thread..My bad ... lets continue

On a few builds with mounts like that, I did try red loctite, but some did come loose. Then I switched to the nylock nuts and they never had a problem. Merc has those thin metal bend tabs but they are a pain in the a$$. And they are more money then the nylock nuts

run two nuts on the bottom side if you have enough room.

I was putting my shopping list together at Summitracing. I discovered that inconel is brand specific to Manley. Upon further research, my 420 may already have them. That assumes the builder that rebuilt it put inconels back in it. When I pull the heads off, how can I tell if they are Inconel already? And what valves should I put in if they are not Inconel?

Ooooopps. Yes, I meant to put it in the other thread.

No thread was deleted. Just some posts of no value

Inconel has been around since the 40s, with many different grades, there is even a company out there tat can 3d print with it.