Hi 6cyl . . . a cast iron Clark header hmm . . . never knew there was such a thing.
Now there was such a set out on ebay last spring - fetched six hundred!
Bench Racing Post circa April '12 But the construction of these headers was discussed in Speed Age magazine - September 1950 - which characterized them as 'stamped steel':
Bench Racing Post crica November '07 So the cast construction of the set on ebay has me puzzled.
I haven't even seen photos of the stamped style depicted in the vintage ads.
Seem to be fairly rare pieces . . .
regards,
stock49