4age bigport head: port & polish

[Corey]

yo

I took off the head from my celica



i have a question about valve guide - can i totaly cut it?


my valves and guides will be safe?

[apardal]

I guess you can. I've done that in my 4A-GE's head after changing the valve guides with copper ones and car is running fine until now.

Bill Sherwood recommends to do that in his site.

Best regards

[jamiemirror]

You can cut them if they are made from bronze.
I will not cut even bronze ones - just personal opinion

[Corey]

thanks alot

[BenR]

i wouldnt bother cutting them, if you reshape correctly you will not loose any flow by having them.

Plus cutting them makes them wear slightly unevenly.

Those celica ports are so big that you dont have to worry about the guides being in the way.

[Os7213]

Yes these questions have already been post read this topic very informative

Thank BenR and everyone!
Ugo

[eight-six]

Just to resurrect an old but good thread …

I have started to mess around with a spare big port head with the intention of installing it at some point in the future. (Complete with 288 cams and ITBs).

I have been following what’s been explained in this thread and literally removing nothing more than the casting marks and cleaning them up.

Following what BenR has mentioned I have looked at the bowls and started to remove the ridges that are present. In some areas this is going fine, but in others due to how the head has been cast there are low spots. So I was wondering – do I carry on trying to level out these low spots or do I try and raise them some how (JB Weld then grind back).

I am just conscious about removing too much material and have been careful to remove only what I need. Should I worry about the low spots?

[oldeskewltoy]

a few photos of combustion chamber de-shrouding...


using a burette to measure chambers...


my first chamber.......



No longer practicing......
Cylinders 1 & 2 - top photo shows before, bottom after


Cylinders 3 & 4 - top photo shows before, bottom after


Chamber volume before the work was begun 36cc to 36.25cc. Volume when finished 37.5cc for all chambers. Head was shaved to come up with a final volume of 33cc










and some new photos of 4AG head work... this is a street port
intake side


exhaust side...

[totta Crolla]

Excellent head work there OST
You might need a bigger Burette than that though :wink:

[oldeskewltoy]

totta Crolla Wrote:Excellent head work there OST
You might need a bigger Burette than that though :wink:

Yes... that is coolant I used.