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2012 Cruze LTZ 1989 StarQuest 2004 TrialBlazer EXT
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ANOTHER UPDATE BEFORE APRIL 1ST:

I received word today that by the end of next week I should have, what I anticipate, are all of the parts and supplies needed for my build! :)
Awesome, once the machine work is done the real fun begins.
 

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The Nuclear Option
2015 Chevrolet Cruze LT 1.4L Turbo
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Discussion Starter · #82 · (Edited)
UPDATE: As some of you know I only took a week off before coming back. But while I was gone I received my remanufactured cylinder head, shown below. The valves and valve seals were replaced by the machine shop that rebuilt the head. I'm replacing the valve springs, retainers, lifters, rocker arms, and cams. I'll also be replacing the exhaust studs, timing tensioner, and water outlet as well along with many other OE parts.

The head as it came out of the box:

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I've replaced the valve springs and retainers already. Before I get to the picture, (or "car porn" as my wife calls it), I would like to comment on the process. I know that there as several of you that have talked about wanting to install new valve springs but are intimidated by the process. This is understandable as ZZP "highly recommends" not removing the head to install valve springs. They even commented to me that: "They really can't be installed with the head off the vehicle. You'll have to return the head to the vehicle." This is FALSE. It is true that most valve spring compressors won't work on the LUJ head because of the design of the PCV passages, but there are those that will that aren't $300. If you have the ability to take the head off, you have the ability to change the valve springs. Personally, I can't imagine how frustrating it would be to replace the valve springs with the head ON the car, especially installing the valve locks (keepers). Feel free to ask questions if you have them. Now for some pictures.

The assembled stock springs:

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What came out:

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What's going in:

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ZZP valve springs and Titanium retainers installed:

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The Nuclear Option
2015 Chevrolet Cruze LT 1.4L Turbo
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Discussion Starter · #86 · (Edited)
I mean isn't putting a head on a pretty big deal? Timinng, head gasket, etc.
If you have the confidence, time, knowledge, and the correct tools, No.

It is more complicated than say, changing a water pump, but just like changing a water pump,, if you follow the procedure and take your time, it's no big deal. It does require some special tools that are to do the job.
 

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COTM Winner
2012 Cruze LTZ 1989 StarQuest 2004 TrialBlazer EXT
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UPDATE: As some of you know I only took a week off before coming back. But while I was gone I received my remanufactured cylinder head, shown below. The valves and valve seals were replaced by the machine shop that rebuilt the head. I'm replacing the valve springs, retainers, lifters, rocker arms, and cams. I'll also be replacing the exhaust studs, timing tensioner, and water outlet as well along with many other OE parts.

So im curious as to how you replaced the rockers and lifters :LOL::ROFLMAO::LOL::ROFLMAO::LOL: and yes im giving ya a hard time :p and personally I'd rather do the springs with the head off as it gives the opportunity to inspect the seats and valves, stems , guides , and seals.
 
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That’s some good info ! I do have a couple questions. If one was to try to attempt with the head on the car, can the cams be removed without messing with the chain and gears ? I understand timing would need to be set after the install. Other, what did you use in the end to compress the springs ? Was it a proper tool or a DIY like I’ve seen on youtube

thanks
 

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The Nuclear Option
2015 Chevrolet Cruze LT 1.4L Turbo
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Discussion Starter · #89 ·
So im curious as to how you replaced the rockers and lifters :LOL::ROFLMAO::LOL::ROFLMAO::LOL: and yes im giving ya a hard time :p and personally I'd rather do the springs with the head off as it gives the opportunity to inspect the seats and valves, stems , guides , and seals.
That was the hardest part! ;)

For those of you who don't know, the rocker arms lift out and the lifters pull out with slightly more force.
 

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The Nuclear Option
2015 Chevrolet Cruze LT 1.4L Turbo
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Discussion Starter · #90 ·
That’s some good info ! I do have a couple questions. If one was to try to attempt with the head on the car, can the cams be removed without messing with the chain and gears ? I understand timing would need to be set after the install. Other, what did you use in the end to compress the springs ? Was it a proper tool or a DIY like I’ve seen on youtube

thanks
On the LUJ, the spockets/cam phasers have to be unbolted from the cams, but the timing tool set allows you to leave the chain and cam phasers in place so you don't need to remove the timing cover and all the components. Here is an example picture, not my car btw. The picture is with the head removed, but it let's you see what I'm referring to:

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I used this compressor to remove the springs:

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Thanks much appreciated! That answered my question
 

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That’s some good info ! I do have a couple questions. If one was to try to attempt with the head on the car, can the cams be removed without messing with the chain and gears ? I understand timing would need to be set after the install. Other, what did you use in the end to compress the springs ? Was it a proper tool or a DIY like I’ve seen on youtube

thanks
This article gives step by step instructions that a Chevy dealership would do it,you do need a special valve spring compressor tool that bolts to the head and has a threaded guide rod to hold the spring down, get the two very small spring keepers, then unscrew the guide rod and do the reverse to install the new ones ... the worse part is you have to but the tool that GM uses which about $260-280 on eBay. The springs are so small and deep into the head other overhead cam valve spring tools won’t work. The one special tool is number EN 50717 kit.

 

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The Nuclear Option
2015 Chevrolet Cruze LT 1.4L Turbo
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Discussion Starter · #93 ·
Update: I have the new lifters, rocker arms, and camshafts installed in the head. I'm going to post some pictures that may seem redundant but I want to post them as reference. For those who don't know, with the ZZP stage 1 camshaft setup, the OEM Intake camshaft gets installed on the exhaust side while the ZZP stage 1 camshaft gets installed on the intake side.

This is a picture of the lifters and rocker arms in place on the right side, and just the lifters on the left side.
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This is the new OEM Intake camshaft that I purchased for the exhaust side.

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For installation, I put break in oil on the cam bearings and a LIGHT coating of assembly lube on the camshaft rollers and lobes. This is the assembly lube I'm using for most of my build.



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Here is the intake camshaft installed in the head.

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The ZZP camshaft cam in a shiny box:

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Once I opened the box, I found that it look almost identical to an OEM camshaft. "ZZP" is stamped on the side of the camshaft and the lobes have a noticeable larger profile.


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This is the head with the intake came installed on the left side and the lifters and rocker arms installed on the right side. After I installed each camshaft, as shown below, I installed the cam phasers bolt (included from ZZP) in the end of the camshaft to test the operation of the valvetrain. NOTE: These are torque to yield bolts, so I will need new ones when I put the head on the car.

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This is with both camshafts installed. The ZZP camshaft (intake) is on top and the OEM Intake camshaft (exhaust) is on the bottom.

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ZZP provides a timing tool for the camshaft ends to go along with the regular timing tools. The tool that ZZP provides replaces the long bar in the regular timing tool set.

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That's it for today. Feel free to ask questions if you have them.
 

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2014 Cruze Diesel, 2007 Cobalt, 1981 Camaro Z28, 2017 Volt
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Interesting that it doesn't change the exhaust side of things...

You've probably said it before, but what are the camshaft specs stock intake to ZZP, as well as stock exhaust?
 

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The Nuclear Option
2015 Chevrolet Cruze LT 1.4L Turbo
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Discussion Starter · #95 ·
Interesting that it doesn't change the exhaust side of things...

You've probably said it before, but what are the camshaft specs stock intake to ZZP, as well as stock exhaust?
Honestly I'd have to ask ZZP. They say with the V3 it's a 10-15 HP increase. It does change the exhaust side of things because the stock intake cam get re-oriented and goes over to the exhaust side and is visably larger than the stock exhaust cam. How much, I don't know...

The only thing I have to show you is marketing this from ZZP: :LOL:

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Well that's definitely an interesting way to do things...use the intake for the exhaust and then bump up the intake. It does make sense though, based on the exhaust as is - you need a big turbo to take advantage of anything exhaust.

Looks like it has a bit more lift/duration going from the exhaust to the stock intake, and then the intake to ZZP intake has a tiny bit more lift but a fair amount more duration, at least just from what I can see looking at a picture.
 

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The Nuclear Option
2015 Chevrolet Cruze LT 1.4L Turbo
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Discussion Starter · #97 ·
Well that's definitely an interesting way to do things...use the intake for the exhaust and then bump up the intake. It does make sense though, based on the exhaust as is - you need a big turbo to take advantage of anything exhaust.

Looks like it has a bit more lift/duration going from the exhaust to the stock intake, and then the intake to ZZP intake has a tiny bit more lift but a fair amount more duration, at least just from what I can see looking at a picture.
ZZP supposedly has a stage 2 and stage 3 camshaft set in development. However realistically, I can't really see them selling well for a discontinued platform.
 

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ZZP supposedly has a stage 2 and stage 3 camshaft set in development. However realistically, I can't really see them selling well for a discontinued platform.
You'd be surprised - the Cobalt hasn't been made for 11 years and it still has a healthy aftermarket/community.

Hell, even what ZZP started on, the 3800/W-Bodies, are still going strong. They actually just introduced a brand new set of their own Coilovers for the W-Bodies. My brother is seriously considering those for his '01 Century to go along with their big ZZP swaybars we already put on.
 
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You'd be surprised - the Cobalt hasn't been made for 11 years and it still has a healthy aftermarket/community.

Hell, even what ZZP started on, the 3800/W-Bodies, are still going strong. They actually just introduced a brand new set of their own Coilovers for the W-Bodies. My brother is seriously considering those for his '01 Century to go along with their big ZZP swaybars we already put on.
exactly what I was about to post. Tons of 3800 interest still.
 

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The Nuclear Option
2015 Chevrolet Cruze LT 1.4L Turbo
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Discussion Starter · #100 ·
You'd be surprised - the Cobalt hasn't been made for 11 years and it still has a healthy aftermarket/community.

Hell, even what ZZP started on, the 3800/W-Bodies, are still going strong. They actually just introduced a brand new set of their own Coilovers for the W-Bodies. My brother is seriously considering those for his '01 Century to go along with their big ZZP swaybars we already put on.
I guess that is true. That's how I found ZZP in 2003. I put one of their turbo kits on my 96 Oldsmobile Eighty-Eight. I had to do the tuning myself because no one supported the first year of OBDII.
 
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