Head Build – Modified
To have a better understanding, you should read this thread first.
I skipped over alot in this thread that is covered in the above thread.
I am going to skip the tear down and tech, and start, a basic clean casting.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6323.jpg)
The guides are good, and I am going to use the customer-supplied parts.
>Manley single springs, Spec sheet 66 lbs @ 1.580
>EPN-Engnbldr Std size Stainless Steel valves
This head was also Belt surfaced, So I have to do a corrective mill to square the head.
I set it up on the grinding bench
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6327.jpg)
I know this head will see turbo use.
I inked parts around the combustion chamber and etched with a head gasket.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6330.jpg)
Did oil port Mod 1
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6331.jpg)
The sharp edge of the combustion chamber was beveled down
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6332.jpg)
A slight champher was done around the rest of the combustion chamber
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6335.jpg)
The runners had some cast flashing removed
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6337.jpg)
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6336.jpg)
Now was time for the valve job, start with a basic 3 angle valve job
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6339.jpg)
Checking seat placement on the valve.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6344.jpg)
Now I will do a throat cut.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6345.jpg)
Notice the difference this makes, See the lip under the seat insert with the rough casting, (left bowl)
The bowl on the right had the throat cut.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6348.jpg)
This leaves a lip also
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6354.jpg)
Now the lip needs remove and blended in.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6357.jpg)
The valves are ground.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6371.jpg)
Then lapped in and back cut
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6386.jpg)
The head is CBN milled
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6358.jpg)
First cut .003
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6362.jpg)
Another .004
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6364.jpg)
I milled another .002 to finish square the head.
Had a bad exhaust stud hole, so a heli-coil fixed that.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6401.jpg)
Valve tip height is checked,
The springs are checked
Spring installed height is measured.
Springs will be installed at 1.530 @ 80lbs
Shims are placed on the head.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6399.jpg)
Then the stock spring pad and Vition blue stem seals.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6400.jpg)
Springs are then buckled up .
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6400.jpg)
The head is now ready for HLAs, followers, and cams and cam caps.
To have a better understanding, you should read this thread first.
I skipped over alot in this thread that is covered in the above thread.
I am going to skip the tear down and tech, and start, a basic clean casting.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6323.jpg)
The guides are good, and I am going to use the customer-supplied parts.
>Manley single springs, Spec sheet 66 lbs @ 1.580
>EPN-Engnbldr Std size Stainless Steel valves
This head was also Belt surfaced, So I have to do a corrective mill to square the head.
I set it up on the grinding bench
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6327.jpg)
I know this head will see turbo use.
I inked parts around the combustion chamber and etched with a head gasket.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6330.jpg)
Did oil port Mod 1
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6331.jpg)
The sharp edge of the combustion chamber was beveled down
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6332.jpg)
A slight champher was done around the rest of the combustion chamber
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6335.jpg)
The runners had some cast flashing removed
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6337.jpg)
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6336.jpg)
Now was time for the valve job, start with a basic 3 angle valve job
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6339.jpg)
Checking seat placement on the valve.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6344.jpg)
Now I will do a throat cut.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6345.jpg)
Notice the difference this makes, See the lip under the seat insert with the rough casting, (left bowl)
The bowl on the right had the throat cut.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6348.jpg)
This leaves a lip also
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6354.jpg)
Now the lip needs remove and blended in.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6357.jpg)
The valves are ground.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6371.jpg)
Then lapped in and back cut
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6386.jpg)
The head is CBN milled
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6358.jpg)
First cut .003
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6362.jpg)
Another .004
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6364.jpg)
I milled another .002 to finish square the head.
Had a bad exhaust stud hole, so a heli-coil fixed that.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6401.jpg)
Valve tip height is checked,
The springs are checked
Spring installed height is measured.
Springs will be installed at 1.530 @ 80lbs
Shims are placed on the head.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6399.jpg)
Then the stock spring pad and Vition blue stem seals.
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6400.jpg)
Springs are then buckled up .
![](http://i261.photobucket.com/albums/ii49/BogusSVO/4G63%20head%20builds/DSCF6400.jpg)
The head is now ready for HLAs, followers, and cams and cam caps.
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