GM used white Teflon tape for years on Q-Jet fuel inlets, not as a sealant, but as a friction reducer, it allowed the flare nut to be tightened sufficiently without rounding the flats. Paul
If GM had flared the fuel line carb end properly they wouldn't have needed to do that
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
