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  1. #1
    Experienced
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    Default How to Know Which Side is the Top of ZR3 Heads?

    So I was doing some reading on how to align the heads on my Corvette. I just moved my Passport SRX from my car that is up for sale to the vette. I'm very familiar with leveling and aiming.....or so I thought.

    Previously I had leveled based on an average of the bottom and top since they are not parallel. The manual didn't seem to clearly explain this.

    I decided to try and find out what the proper way is. After some research on here I found that there is in fact a top and a bottom to the heads and the circuit board is mounted to one of them not to the black plate like I had assumed. Based on the picture I saw of one broken open it makes sense to ensure that you have them oriented correctly and aligned based on only the top surface.

    After reading this and looking at the picture of one opened up I can't see any marking denoting top or bottom on my ZR3 heads. I'm sure one or both of mine are upside down but can't find any marking denoting this. Help?

    So how do I tell if they are upside down? Should the circuit board be on the top or bottom?

    I was thinking I could try and activate them with an IR remote and see which side the IR's are closer to. But once I do this I need to know if the LED's should be closer to the top or bottom. Any input appreciated, thanks!


    Thanks!
    Last edited by 95blklsc; 04-09-2009 at 08:09 PM. Reason: I'm dumb

  2. #2
    Radar Fanatic
    Join Date
    Nov 2008
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    1,764

    Default Re: How to Know Which Side is the Top of Z3 Heads?

    I had same question and was told bubbles on top.
    Thanks to those who gave me the quick responses too.

  3. #3
    Experienced
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    Default Re: How to Know Which Side is the Top of Z3 Heads?

    Thanks, I'll take a look before I get in the car to go home from work and see how I have them mounted.

    I'm surprised the manual doesn't state this. I think it must be pretty important.

  4. #4
    Experienced
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    Default Re: How to Know Which Side is the Top of Z3 Heads?

    Well one was upside down it looks like. Is the conformation from escort somewhere that bubble up is in fact the correct mounting?

    Also, FYI for anyone with a C6 Corvette. If you have the rear license plate jammer mounted, it will prevent you from opening the rear hatch with a key if you FOB dies. This could be a problem as this is the ONLY way to open the car if you have a dead battery in the car or remote. If you ware at home no biggie, get a screw driver and take the jammer off but it might be more of a pain if you are away from home.

  5. #5
    Speedtrap Crasher
    Join Date
    Aug 2006
    Location
    Houston, TX
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    6,732

    Default Re: How to Know Which Side is the Top of Z3 Heads?

    I went by the "rcvr" decal on the back. going by that reference it's bubbles up.
    Project "BONES" Speed Lab:
    Valentine One, Blinder M47 "All Front Configuration"
    Pro97 Police Scanner
    1 Saves / 3 Strikes as of 8/22/2009
    Estimated saves in U.S. Dollars: $200

  6. #6
    Experienced
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    May 2008
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    Default Re: How to Know Which Side is the Top of Z3 Heads?

    I'm going to go turn it around shortly, but I don't think mine have a decal.

  7. #7

    Default Re: How to Know Which Side is the Top of Z3 Heads?

    If you hold the head so that the front of it is facing the sun, you should just be able to see the edge of the circuit board and the emitter LEDs.

  8. #8
    Yoda of Radar
    Join Date
    Jul 2008
    Location
    Dallas, Texas
    Posts
    14,449

    Default Re: How to Know Which Side is the Top of Z3 Heads?

    Whoa, wait a sec. Are you talking about Z3 heads, or ZR3 heads? I think I may have misunderstood this post and moved it inappropriately. I'm not familiar with a Z3.

    "Buy the BEST and screw the rest." - fire65

    "im intrested to see how well you do.i never seen a car JTG before would be a first for me.." - radarrob

  9. #9

    Default Re: How to Know Which Side is the Top of Z3 Heads?

    I missed that too. What is a Z3?

  10. #10
    Radar Fanatic
    Join Date
    Nov 2008
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    1,764

    Default Re: How to Know Which Side is the Top of Z3 Heads?

    I think he meant zr3
    I could be wrong. just ask my wife.

 

 

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