So far I have been unable to solve the problem of how to connect straight header pipes into the exhaust manifolds that have a large bevel on the bottom. All the photos I have been able to pull up on this engine [351 either E or M] show ears on the bottom of manifold to bolt the header clamp up securely, but these manifolds have no ears. Have any of you guys ran into this prob? and how did you solve it? An exhaust shop stuck the new straight header pipes up into the cast manifold and tacked welded them- you know how long that lasted-. Does anyone know where or if custom headers are available for these big V6 engines, the addition of a collector to the header pipe would solve my problem! And get my buddy back into his "big ugly truck" as he calls this '68 C60 with a'78 Chevy crew cab with big rubber flares.
