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420A Cam Cap Replacement

Posted by BLACK'98DSM, Nov 24, 2020

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  1. BLACK'98DSM

    BLACK'98DSM Proven Member

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    Can I interchange cam caps? The ones that go to the head I just built are fried. And it would be a shame to not use that head because of the cam caps not matching. I have multiple sets of 420a cam caps so if I can use another set then great.
     

    Road Race Build 4K  11  24

    1998 Mitsubishi Eclipse N/T
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  2. DirtMcGirt

    DirtMcGirt Probationary Member

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    The caps are specific to each head, however you could look into the cost for a machine shop to add material where needed, and do what I believe is called a line bore. If it’s possible and cost effective, that may your only option since you can’t use the proper caps.
     
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  3. motomattx

    motomattx Proven Member

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    The caps are part of the head assembly, it might be cheaper to find another good casting then trying to have what you have machined, if the caps are junk the journals in the head have to have damage also.
     

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  4. BLACK'98DSM

    BLACK'98DSM Proven Member

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    Well I had the journals on the head machined, I just forgot to give them the cam caps as well. I'm concerned about machining the head yet again, it might take away too much material.

    Really hoping it works out though. I have many hours and a bit of money into this head.
     

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  5. VelocitàPaola

    VelocitàPaola Moderator

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    I'm not sure what they could've machined without the caps...
     

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  6. BLACK'98DSM

    BLACK'98DSM Proven Member

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    20201125_193300.jpg 20201125_193244.jpg
     

    Road Race Build 4K  11  24

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    2010 Subaru WRX
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  7. VelocitàPaola

    VelocitàPaola Moderator

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    But they never asked for the caps? What good is it to have just half of the bearing surface machined?
     

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  8. Mello

    Mello Proven Member

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    What type of machine shop would machine half a bearing in the first place. I'd think any competent shop would have spoke up & raise a red flag at minimum, or more so refused to do it until the caps were included.
     
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  9. BLACK'98DSM

    BLACK'98DSM Proven Member

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    Yea that's not the only issue I had with this shop. They did a damn good job milling the head and resurfacing the block, but were terrible on all other aspects.
     

    Road Race Build 4K  11  24

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