K Series Mid Port Heads

[Andy43]

I'm after any info on K series mid port heads.

What engine did they come off ?

What model toyota were they used on ?

Has anyone compared them to bigport or small port ?

Is there a High and Low comp version.

 

I was going to rebuild the one I have and do a dyno run, to see if its any better that our bigport.

But I have just been told its soft so want so sus out if its worth while chasing another one up.

 

Thanks

Andy

[Twinky]

Mid port head? Pics?

[Andy43]

I'll post some pix when I get the head back from the workshop. ( Friday)

They look the same as a small port but inlets are about 27mm.

I suspect they may out perform a bigport due to a better intake manfold design.

If you look at a bp inlet manfold you will see a massive restriction about 20mm inside the port as the runner srinks down from 30mm to about 27mm.

Where as a midport is about 27mm all the way to the plemem chamber.

I want to prove this on the dyno.

 

 

Mid port head? Pics?

[tojo2]

sounds like the dished piston 4k/5k heads with smal combustion chambers?

[TheNOBBLER[RL]]

You might pick up low to midrange a bit due to the increased air speed with the smaller ports and inlet manifold runners, will be good to see how you go.