Hi guys im looking at getting a custom plenum made by Arial from custom plenum creations in wollongong.I have noticed that my head has 8 ports(obviously),but the plenum only has 4 tubes(if u know what i mean).Will these 4 tubes cater for 2 ports per tube?

Yes, if the 4 tubes are oval and cover the 2 ports.

if they don't match properly you'll be going backwards in terms of flow.

if your aiming below 400hp i would keep the stock manifold. money would be better spent on ecu or cams

Hi guys i dont have the original plenum or manifold,the motor didnt have it when i bought it.I have talked to Ariel and for $400 he will port the head to match the plenum.

like this one ?

sounds like you have it worked out :) Would love to do a custom port job on my head. Big valve/cams Max sized 8 ports, injector per port and single runners. +50 psi hahah

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I've got a few spare stock plenum s and intake manifolds for a ca if your interested.

If you want a different option, I have a complete stock manifold with sensors for $50 in qld

Thank fellas,ill give the standard plenum and manifold a miss.Im spending 40g on the build over 4-5 yrs so another few grand isnt going to matter to much.
Yeah oda thats the style.

That custom one is old tech much better designs available now, look up some Cosworth dual plane inlets manifolds and even some audi race ones for ideas if you are going crazy.

The stock ones work very well and can take bigger TB / Airflow meters etc.