Hey, i've taken the inlet manifold off my smallport 4age to do a bit of work to it, anyway, i noticed that the ports on the manifold are quite noticeably smaller then the ones on the head...... whats the go here then? Surely they didn't come standard like this? I'm thinking of porting out the manifold to match the head, but il ask here first just in case.

Am i maybe missing something? Is there a plate thats ment to be bolted between the manifold and the head?

 

Piccy attached so you know what I'm going on about, the dark oval visible on the flange is where the inlet port has been bolted to, and you can see the smaller inlet from the manifold sitting 2mm or so inside it..

Edit: also, why do all the inlet pipes on the flange have that groove in the side of them? You can see in the pic..

Edited June 23, 201214 yr by BlueKsev

Ah nevermind, had a look at the ports on the head and noticed they flare outwards right at the entrance where the manifold bolts to, so i am thinking this is a design feature from Toyota, something for airflow