Black Jack Brand headers were marketed by the Mr. Gasket Co. Manufacturer ??? The time period (Mid-late 70's) had Mr. Gasket Co. buying & selling various companies and marketing products under their name and other (Parent or Sub-Companies) Later Mr Gasket became Mr Gasket Performance Group. WR Grace was a major player then and a Leading NHRA sponsor...series Sponsor, Remember the WR Grace Cup... Awards?
Many members here have N.O.S. boxes & packages along with Catalogs... lets look those up and read the info, credits & disclaimers on those packages & Catalogs.
The Headers pictured are an early set of Appliance. Bought in 69 for a Z/28 & Look just like a set of Black Jack's I had on my 69 SS 350 except the collectors were 3 bolt swivels.
DON'T USE GASKETS !!! Mate the header flange to the head, filing and grinding to fit square & flush and you'll never have to re-tighten them after initial warm-up and re-tighten .... of course using lock-tight helps.
