How to modify the 3vz-fe cylinder head (and others).

[4v6]

A little update on these ports.

Ive recently done some further work to identify seat geometry changes and see if they can be improved also.

The short answer is yes they can.
Ive experimented on only one port runner of the pair but even so ive found some gains that are very definitely worth having.

Just some simple adjustments to the widths of the intake seats on the valves, an angle change from the seat in the head where it transitions into the ports parallel section and ive gained 6cfm (at 28" depression) on just this one port runner with an immediate gain apparent almost from when the valve leaves the seat to 7mm lift.
Anomaly popped up when the flow intersected at that figure then diverges once again at the last couple of mm lift by around 8 to 10 cfm, not that im complaining but it would have been nice to see it above the previous stock graph trace all the way, cant have it all ways i suppose and it may just be a measurement error but ill eliminate that on the next test i do when i re-run it.

Add this extra flow in over all the intake runners ( wont double up mind you- never does) and its looking like an extra 10 maybe 12cfm per port right where you want it- off the seat upwards and most all the way back down again.

Obviously theres no way to know what the total gain would be on each port set until i do them- thats for another day as are the specifics of what ive altered.

[Scone Racing]

Hi guys, I apologize for drudging up a older post.

First i want to say thanks to the people who provided info in this thread.

My buddy is going a 3vz-fe into an MR2 and I ported his heads, lower intake, and exhaust manifolds for him. Unfortunately I didn't get pics of the manifolds, I basically removed casting oddities and bumps and rounded corners that had sharp turns... as well as opened up the collector part ALOT on both mani's.. Anyways I kinda do this as a hooby and have ported Skyline GTR stuff, Patroit LS1 heads, Grand national heads and 2.3L Ford OHC turbo heads. I am a home hacker, but so far the results have all been positive on track and dyno as far as gains. My SVO runs 11.80s @ 115 MPH on the stock short block, ported head, T3/T4, atr header, big I/C, 55 lb injs, stock ecu and vane air sensor [spring tightened to run 55s for now], stock T5, 3.73s, slicks, and 26 psi boost.

Anyway, here are a few pics... sorry my camera is a 50 dollar pos, and he came and got the stuff b4 I could get manifold pics and some good intake pics. I really didn't enlarge runners at all, removed the material pretty much competely around the valve guide in the ex bowls, tapered the guides, fix the shaprt short side radius these heads have, and then just smoothed and blended everything. On intake side I move the divider back a little, thinned it out some, really fixed the short side [it was bad in the intake bowls] then just smoothed and blended it all... In the lower intake I removed the bump.. then smoothed it all out. I apologize for the length, and wish I had a better cam.. the heads actually turned out decent, and when I flipped them to do pics of the bowl work, the batteries calfed






Here is some of the other stuff I have done, I like to restore vintage MX bikes as well..
Index of /

Ported head pics are the ones that start with "os" and skyline.

[LynchburgCSI]

Dang it! The pictures are dead.

edit: well actually, this works... Head porting for lower boost and higher power | Supercharger Performance and Engine Performance Parts