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Hello:
Don't know what your putting headers on....but i'll pass this along. When I had my race car (2 door post 67 Dart with 440) I had a interference problem with the combination of ARP Studs, Edelbrock heads, and TTI Under chassis headers (1 7/8) The studs stuck up just enough to keep the header flange plate from fitting flat on head surface. Yes the studs were installed correctly.
I solved it by grinding a slight angle down taper to the top of each stud. Allowing the flange to slid over and fit flush.
I'm sure others have seen this issue also. I might mention that the block had been surface trued how much that small amount contributed to the problem I don't know.
As to the coating these were chrome and of course turned that wonderful blue color in no time.
Anyway thats a small bit of FYI.

Maynard

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