Driver 318 cam/valve issues?

Small Block Mopar Engine

  1. Traxfish

    Traxfish Convertible Cruiser

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    I'm in the process of giving my barracuda a valve job, removing the heads and cleaning everything. I verified it has a sticking valve with a piece of paper getting sucked to the exhaust test. The engine was ran with a badly rusted gas tank and red particulate for a while which I blame for bad carbon buildup. It had strong vacuum, if not a steady vacuum, so I didn't suspect other issues. It ran pretty strong except for a seemingly random misfire at low rpms and a lot of water and soot in the exhaust, with some oil burning especially when cold, and gas mileage much lower than expected (~13). The entire fuel system up to the manifold has been replaced under my care.
    Engine idling:

    Would you suspect other issues?
    Soot is probably carbon buildup in the valvetrain but could the water be another issue?

    Once I got the manifold off, I looked at the cam and the wear patterns concern me. Some of the lobes are worn across the top. How normal is this? I have not yet looked at the lifters.

    [​IMG]
    If the cam and lifters need replaced, what is the OEM lift/duration? This car is a driver/cruiser and I like the low end torque. It shouldn't see high RPMs often.

    I have several books including the Plymouth service manual but not the experience of building and tuning one myself. Trying to get the latter.

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    Last edited: Jun 7, 2021
  2. yellow rose

    yellow rose Overnight Sensation

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    Cant see the pictures
     
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    • toolmanmike

      toolmanmike Moderator Staff Member FABO Gold Member

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      Yep, best to just load those photos directly to the site.
       
    • Traxfish

      Traxfish Convertible Cruiser

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      Done. Not sure what to do about the video.
       
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      • toolmanmike

        toolmanmike Moderator Staff Member FABO Gold Member

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        The only vids work here is copy the link to you tube or the like. ANything more than a gif won't run here as a direct upload..
         
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        • yellow rose

          yellow rose Overnight Sensation

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          I didn’t see anything that made me cringe.
           
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          • Ricks70Duster340

            Ricks70Duster340 Child of the King FABO Gold Member

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            Looks like normal cam wear to me.
             
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            • AJ/FormS

              AJ/FormS 68 Formua-S fastback clone 367/A833/GVod/3.55s FABO Gold Member

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              I want a cam like that!, lol

              If that is an original hi-compression 318, those certainly are torquey.
               
              Last edited: Jun 7, 2021
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              • Traxfish

                Traxfish Convertible Cruiser

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                As far as I am aware, it's OEM, which means 9.2:1, 230 hp and 340 lbs ft at a low 2400 rpm. Great numbers for a driver. I figure it puts about the same power to the wheels as my 2012 focus daily driver (~160 hp) but more than double the torque, which caught me off guard when I got over confident in the rain lol.
                 
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                • 413

                  413 Well-Known Member

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                  Looks great for a used cam, nothing wrong at all. Look how clean it is inside, very nice.
                   
                • Brooks James

                  Brooks James VET, CPT, Huey Medevac Pilot FABO Gold Member

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                  The problem with a fresh valve job on a tired motor is the increased cylinder pressure on the cylinder/rings is going to make wear and blowby worse. I had a buddy that did a valve job on his z28 and it doubled oil consumption to
                  A quart every 400 miles.
                  Is a basic rebuild something you’re willing to do. I would guess that you could do it for about $1200 barring expensive machine work !
                   
                  Last edited: Jun 7, 2021
                • plymouth67

                  plymouth67 It be a lot cooler if you did...

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                  Your video to me almost sounds like the timing is pretty far advanced and its dropping cylinders.
                   
                • Traxfish

                  Traxfish Convertible Cruiser

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                  I've considered that a rebuild is in order. I was hoping to get this done myself, but I would definitely need help with a rebuild. I'm kind of stuck right now as the exhaust manifold bolts to the y pipe are badly corroded and I'm having a lot of difficulty turning them by my self. I really should replace the whole exhaust system as well.
                   
                • Traxfish

                  Traxfish Convertible Cruiser

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                  Timing was adjusted in 2019 by a local shop, as they had the same thought. It did this before and after the timing adjustment.
                   
                • RedFish

                  RedFish FABO Gold Member FABO Gold Member

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                  You didn't say if you did compression test or any other/further diagnosis. Simply switch 2 plug wires to make it run poorly and suck a piece of paper up the tail pipe is a shady mechanics trick. Let us know if you actually find a sticking valve.
                   
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