triple weber manifold comparison,runner lgth

[s14280zx]

I'm building an F-54 block, and a N-47 head for my 79 280zx, and I'm putting triple weber 40mm dcoe's on it. I have a set already, but I've seen on ebay some manifolds have long runners and some have short runners. Are there any advantages between one or the other as far as power? I think mine is a TWM from what I've been told. It seems to have short runners. I appreciate all of your input.

[JMortensen]

The TWM is a middle length. The Mikunis have very short runners which makes the turns inside the runners more extreme, the Cannon has longer runners, but their castings suck so a lot of cleanup work is necessary to fix them. The TWM is right about where the old Nissan Comp manifold was for length, and is a good starting point. If I were buying another manifold I'd ditch my Cannon for a TWM. Apparently you need to grind or modify that manifold a bit to get the Webers bolted up, so don't be too surprised when that happens.

[Collectindust240Z]

I've got an old interpart manifold for my Dellortos. Is that the old Datsun Comp. manifold?

[s14280zx]

Thanks for your input. What effect does the runner length have as far as powerband,(low end torque, throttle response, etc.)? Is there a preferred length over others, or not enough difference to worry about? I'm just curious, and I've read a few things about my 240sx ka24de engine that says the long runners on the intake manifold make the engine have lots of low torque, but makes it rev to a lower rpm and has less high end power in return. Would the L28 with carbs be effected similarly by the runner length?