While you’re researching see if you can find some documentation or tests to back up this statement:
“The Fenton header is a MUCH more efficient header and to my eye a lot better looking
than the Vette “manifold.”
Since the cylinder head (specifically the exhaust valve shrouding) is the weak link in the chain I can’t see that any appreciable difference would be found between the vette manifold and the Fentons.
As for looks IMO the 2 different outlet directions looks goofy and the heat tube setup looks like “exhaust system life support” not to mention the 2 different gasket types required.
Curt,
Since we are just speculating and stating opinions, here are my weak opinions:
1. What produces efficiency? The Fenton unit certainly has smoother turns/curves for the exhaust flow. I would not even dare to guess/state if the difference would be measurable.
2. Yes, the Corvette's heating of the intake manifold is much neater (see image above).
3. Is it possible hat the angles of the Fenton outlets were chosen to: (1) rearward piece: allow the attachment of the standard/original car/truck exhaust pipe (the correct angle)? Also, might the angle of the forward Fenton pipe have been chosen to avoid interference when used in an automobile?
3. The use of two different styles of gaskets is hard to understand/explain.
