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 Post subject: valve guide lenght chi4v
PostPosted: Tue Feb 13, 2018 6:14 pm 
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Joined: Tue Jun 02, 2015 2:28 pm
Posts: 167
Out of boredom(no snow)I pulled the chi-4v heads off my 408c just to have a look.It started with the 4-speed trans. problem and moved on from there..(really it did)
Why not get out the porting tools? They could use a little clean up..The castings are off a bit or more on one head compered two the other.

SO how short can you safely cut the valve guides? Rule of thumb?
IN-2.5
EX-2.3
Stock...


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PostPosted: Tue Feb 13, 2018 6:46 pm 
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Joined: Mon Oct 29, 2012 9:05 am
Posts: 2175
I wouldn’t worry about the length as much as the shape. You can contour the shape of it and the surrounding aluminum.

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PostPosted: Tue Feb 13, 2018 8:34 pm 
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Joined: Tue Jun 02, 2015 2:28 pm
Posts: 167
The guide hangs out about 10mm .390 th
Just looked like a lot to me..
As normal I will adj. as I fell comfrortable with.
and tell myself later what a bad idea it was..

working on the 2nd head tonight that is almost perfect compered to the first head.
You never know what you are going to get from the casting gods.
next set I will pay for the CNC


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PostPosted: Mon Feb 19, 2018 3:56 pm 
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Joined: Tue Jun 02, 2015 2:28 pm
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WELL after a lot more work than I had antisapated cleaning up the CHI-4V heads... it is going back together.
If you look at the web page it shows you this really nice head (4-V)but that one is CNC ported!
Not the one you get unless you order it..... THE flow numbers............... Who knows were thay came from.
I have real porting tools NOT a dremel or air and it took far more time(hours) to just clean them up than need be..

I did cut the valve guids all the way down...I dont have a dyno or a air flow unit.....I Can only hope for the best....

I have photos but it takes to much time at this moment..


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PostPosted: Tue Feb 20, 2018 11:11 am 
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I will get the photo thing some day


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