What difference can be noticed on a turbochaged big port head with the big port vs small port vs custom intake manifold ?

Thanks for help.

Claude

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Bigport has bigger ports, which can potentially make more power (depends on boost levels, turbo/trim, and tuning). Bigport and smallport are about equal boosted. Smallport has the added advantage of being workable, ie: porting and reshaping whereas the bigport isn't (ports are too big to make a lick of a difference). Smallport will have a stronger mid-range versus a bigport without TVIS. The main thing... boost is the equalizer. In n/a form, I'd say smallport all the way...

As far as intake manifolds go... depends on what you mean by custom.

I mean by custom intake manifold ; a bigger square aluminium box with four bigger runner coupled with a 3" throttle body. (we can see some example on club4ag).

Thanks for help.

Claude

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i looked around alot on club4ag go look at there tech section it talks aout the big port and small port

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You misunderstood my question... but heheh... ok. A custom intake manifold performs relative to the engine. If you're talking a higher volume manifold... you can potentially make more power... but that's assuming a stock manifold is restricting your set-up. There are a LOT of things to consider when talking about custom intake manifolds... something I don't want to get into right now... =/ Let's just say it depends on what's pushing air through that manifold.