Head Build – Modified

[BogusSVO]

Head Build – Modified

To have a better understanding, you should read this thread first.

http://www.fordfestiva.com/forums/showthread.php?t=44072

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.

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


I know this head will see turbo use.
I inked parts around the combustion chamber and etched with a head gasket.


Did oil port Mod 1



The sharp edge of the combustion chamber was beveled down


A slight champher was done around the rest of the combustion chamber


The runners had some cast flashing removed




Now was time for the valve job, start with a basic 3 angle valve job



Checking seat placement on the valve.


Now I will do a throat cut.


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.


This leaves a lip also


Now the lip needs remove and blended in.


The valves are ground.


Then lapped in and back cut


The head is CBN milled


First cut .003


Another .004



I milled another .002 to finish square the head.

Had a bad exhaust stud hole, so a heli-coil fixed that.



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.


Then the stock spring pad and Vition blue stem seals.


Springs are then buckled up .


The head is now ready for HLAs, followers, and cams and cam caps.

[Grey Vw]

Wow, thank you for all threads you have been doing lately. This is all new to me and very fascinating.

[hodginsa]

You seem like an awesome machinist! But your picture taking skills could use some work haha no offense, but they are just really blurry, hard to see your highly skilled work.

[Basement_Modder]

Agreed on the blurry pictures, but also on the highly skilled work. Does your camera have a macro mode? (little flower symbol) If so, turn it on and shine a light (anything, even a flashlight) on the medium while you take the picture. (only applies if there are shadows)

Love the work. Very professional.

[BogusSVO]

I have a diffrent camera I use now, some of these are older and have been posted on onther fourms, One fourm was "kind" enough to help me with the photog skills.