4G63 Head build - Modified

[BogusSVO]

4G63 Head Build Modified

If you have not read http://www.dsmtuners.com/forums/cylinder-head-short-block/420045-how-have-4g63-head-rebuilt.html Read that one first, a lot has been left out in this build that has been covered in that thread.

Please keep in mind some machine shops can not do what is shown in this thread, due to equipment and tooling limitations.

I am going to skip the tear down and tech, and start, a basic clean casting.

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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

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

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Did oil port Mod 1

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The sharp edge of the combustion chamber was beveled down

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

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The runners had some cast flashing removed

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

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Checking seat placement on the valve.

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Now I will do a throat cut.

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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.

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This leaves a lip also

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Now the lip needs removed and blended in.

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The valves are ground.

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Then lapped in and back cut

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The head is CBN milled

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First cut .003

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Another .004

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I milled another .002 to finish square the head.

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

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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.

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Then the stock spring pad and Viton blue stem seals.

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Springs are then buckled up .

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

 

[TSITurbo95]

As usual, a GREAT write up. Good work and keep up the great work!!!

 

[Lofty]

Wow this head looks great!

Nice work dude!

 

[GRAVEDIGGER]

Thanks for sharing some of your infinite wisdom Bogus! Very nice writeup!

 

[JwpRider]

One of the most knowledgable 4G63 'Wisemen'...and don't even have a DSM! Thanks for your continued education of our membership!

 

[19BLACKGST98]

It looks really good. How much do you charge for the head work?

 

[G-UNIT]

If you have to ask, you can't afford it.

 

[SpiderGST]

You kinda have to ask to know. Hell Im about to pay 1500 for my machine work and assembly on my block and head. That is just assembly not putting the head and block together doing that myself.

 

[ColtiXim]

Nice writeup !
Flow bench result, before/after work ?

 

[G-UNIT]

When someone is doing this kind of work you are at their mercy as to what they charge. So if you're not able to put up the kind of dough he is asking then you have to try and find someone cheaper. Which means you buy cheap you buy twice.

 

[rx7ttlm]

I would be worried because it looks like the oil galley was bead blasted... Hopefully they used soda instead of glass... Problem with glass is when the aluminum heats up it releases some of the glass media that was embedded in the casting... Then it ends up in your oil. Also the cam journals don't like being blasted. Good luck bro.

 

[BogusSVO]

Xr... I have been glass beading heads for about 20 years, and tons of other shops do too.
As long as proper methods are in place there is no issue with glass bead.

 

[keltalon]

Nice Job Bogus!!!

 

[bradselph]

Can i move in to your shop?


kidding wish there was a machine shop like you other than one in orlando and even that is 2+ hours away

On another note what was the purpose for the combustion chamber? besides just smoothing it out.

 

[Thruapole]

I would love to see how you check the valve tip height and the installed spring height. I do V8 heads all the time, but my tools cant get down in the cylinder head, and have a range on 1.600 to 2.300 inches I believe. Can you post a picture or name what tools you have please? I would greatly appreciate being able to check all these items on my own cylinder head. Thanks
-Matt

 

[hotrodssnova]

What is the installed Valve tip height? Its not in my manual. And it is not on this site.

 

[BogusSVO]

According to AREA, and the spec I go by it is 1.920-1.950

But I have checked heads and have found them to be out of this range, more so the early 1g heads than the 7 bolts.

I am fairly sure it is posted in a few threads, it is one of the more common questions.

 

[miliman13]

What is the installed Valve tip height? Its not in my manual. And it is not on this site.

I still don't fully comprehend this? What is it, were, and how do you check it? With what tool? What is the results of having in/out of spec?

Thanks

 

[keltalon]

I still don't fully comprehend this? What is it, were, and how do you check it? With what tool? What is the results of having in/out of spec?

Thanks

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[miliman13]

According to AREA, and the spec I go by it is 1.920-1.950

But I have checked heads and have found them to be out of this range, more so the early 1g heads than the 7 bolts.

I am fairly sure it is posted in a few threads, it is one of the more common questions.

Thanks kels! Is this spec across the board even when dealing with aftermarket valve train?

 

[Kapok6]

According to AREA, and the spec I go by it is 1.920-1.950

But I have checked heads and have found them to be out of this range, more so the early 1g heads than the 7 bolts.

I am fairly sure it is posted in a few threads, it is one of the more common questions.

I am very glad you posted this. It seems to be a lot harder to find than it should be.

As always, I greatly appreciate you threads. I have learned a lot from you.

 

[hotrodssnova]

Thanks kels! Is this spec across the board even when dealing with aftermarket valve train?

It's the same because we have hydraulic lash adjusters. If you were to run solid lifters, you would have to grind the tip OR get an adjustable rocker to set lash.

 

[BogusSVO]

Get the tip height too tall the HLA will fully compress and the valve will hang open.

Get the valve tip to short, the HLA will fully extend and you get a tap, or the HLA comes apart.