Which old header company painted their headers blue?

[SJZ]

While working on the 72 240z last night I noticed traces of blue paint on the 3 into 1 header flange where it bolts to the head. My father in law put the headers on in the 70's I'm guessing and I'm just curious what brand they are. Anybody remember whose headers came painted blue? 

[crayZlair]

Pretty sure that my Clifford Research  Performance (6 to 2) headers were blue, but I've had them since 1982. Seem to remember their advertising line being "6 equals 8".

Edited October 8, 2021 by crayZlair
Performance, not Research

[SJZ]

Looked at some pics of Clifford headers online and they sure do look to be the same design. Thanks for the clue!