Has anybody ported and polished their f22b2 naturally aspirated cylinder head and manifolds and gained any performance? If so what technique and shape did you give the ports and bowl. Thank you.

 

Not worth the time and effort. The F22B1/B2 heads have extended coolant ports surrounding the exit of the exhaust ports limiting the amount of material you can move around. It has been my experience that you would be much happier swapping to a PT3 head from the 90-93 F22A* series of engines. The F23 head has been shown to flow very well out of the box, again it suffers from the same coolant ports and has limited porting capabilities.

What are your plans and goals for the engine?

What have you done to the engine that will require increased head flow, or is this just something you want to try to get a few extra ponies?

 

In my case (F20B2, same head as F22B2) I had the head off to do the headgasket, and decided I would just get it ported and polished anyway, and a local machinist offered me a reasonable price for porting. It was the first time I ever had the head off the vehicle (in 2012), and I had no intention of pulling it any time soon after so I figured why not.

I can't give you specs of how much material was removed, or even dyno before and after figures, but I can tell you what was done on the head.

We ported the intake and exhaust ports, but only polished the exhaust side, since I read that the rough finish on the intake side was beneficial to fuel/air mixture. We re-faced the valves since they were all out there, port-matched the intake manifold and head, and did multi-angle valve seat cutting.

Once again, I have NO way of proving how much of a difference in power it made, but all the work above was done for probably $300 if I recall correctly.

in my MIND, the engine pulls harder in the midrange in particular, but I can't say for sure how much that is due to the porting, since I also did HG, rings, vale seals while in there.
I also TRIED to install my Bisimoto "custom level 1.5" cam with the stock valve springs, but it just wouldn't work. The coils were binding when trying to turn the cam over by hand, despite being told up to level 2 cam was good with stock valve springs.

I bought the bisimoto valve springs subsequently, but haven't pulled the head to get around to installing them. If the head ever has to come off for whatever reason, I'll finally do that part.

 

$300 for all that work is a good deal. Image it was more of a clean up then any significant porting. for that Price you would usually get the casting lines cleaned up, blend the bowl and seats and put a 180grit pass on intake and maybe a 400grit on the exhaust.

Take a lot of time to actually polish the ports

My F22A* exhaust ports, minimum 10-12hrs/port for me. mostly polishing time on the exhaust.


and my intake ports, minium 6-8hrs/port - more shaping time in the intake ports


by GhostAccord, on Flickr

These images are all on my 90-93 PT3 F22A head, I wasn't able to get any real increase out of my F22B2 head. Wasted a lot of time on it. Although, it would have been a decent turbo head, if I hadn't drilled holes in it to see where the coolant ports were and how thick the port walls were...lol

 

Beautiful work and beautiful pictures. You are a patient man my friend haha

 

Thank you very much. It is definitely a time consuming hobby! Keeps me out of trouble.