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Thread: 4D55 piston protrusion

  1. #1

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    1985 Dodge Power Ram 50
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    4D55 piston protrusion

    Hi guys (& gals?)- Been "out of the loop" for awhile, but now I'm crawling back for guidance:
    I've just partially completed a 4D55 block rebuild using ITM .020" pistons. Installed #2 and 3 piston/rod assemblies, and it looks like crown protrusion is running about .065". YIKES! Is that TOO MUCH? Can't seem to find the correct specs anywhere.

  2. #2

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    1983 Mitsubishi Mighty Max
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    I will look into it for you but I NEVER had a good set of ITM pistons as all once running made clanking sounds from valves touching piston. No not enough to lock up but enough to make a knock and cause you to dremel the pistons where the valves sink in.

  3. #3

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    Quote Originally Posted by mikewarme View Post
    I will look into it for you but I NEVER had a good set of ITM pistons as all once running made clanking sounds from valves touching piston. No not enough to lock up but enough to make a knock and cause you to dremel the pistons where the valves sink in.
    HMMMM... Did you have this same issue with more than one set of these? I wonder if maybe the pin bore is machined a little too low, causing the piston to ride higher.

  4. #4

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    With maybe 5-6 sets. There answer to the problem was to discontinue making them. Bunch of assholes with their taiwan crap

  5. #5

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    ANYBODY.....piston protrusion........anybody........?

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