Stock 340 manifolds value

Johnny Dart said
"REAL" 340 manifolds, are 68-70 340 HiPo manifolds. P2863549 right P2863553 left.
They are fetching from $400-$500 depending on condition. Sad, but true.

In 71 the 340 came with the same left P2863553 manifold, but went to a more restrictive P3418623 on the right. This is why people have used the HiPo left side manifold, and a magnum manifold on the right.

If you have a set of real 340 HiPo manifolds, they will wake a 318 up nicely. With a 4bbl intake, and a nice dual 2.5" exhaust, you will be pleasently surprised. Will they out flow a nice set of TTis or Dougs, no way.
But for the simplicity of bolting in, matinence, and performance, they are a great choice.

Here they are...the 70s 340 driver and the 60s 340 driver. I (personal opinion) like/prefer the 70s manifold because of the extra ribs. It stabilizes the casting which helps prevent cracks and it gives you a place to mount a piece of sheet metal to protect the plug wires from getting burned. The 60s driver is more sleek and less bulky and much harder to find (more expensive) but they do have a cleaner look. I guess it comes down to preference???:

treblig