1967 383 pushrods vs 1968

Engine, Transmission & Driveline

  1. swisherred

    swisherred Active Member

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    awhile back I was talking about replacing my pushrods and someone told me to go with the 1968 pushrods instead of the 67 for my 383 due to a design change.

    can anyone verify that this was correct and that they will still fit with the stock 67 rockers?

    I found them both online and the 68 is actually way cheaper than the 67, but i dont want to install the wrong parts and damage something. They seem to be different OAL. 8.645" vs 8.575
     
  2. 413

    413 Member

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    Your 67 pushrods have a small end at the lifters. You cannot use 1968 and newer pushrods with those lifters. I have used 67 pushrods that are fine if you are looking for some.

    The rockers arm end is the same size.

    I don’t know why they did that, I drag raced a 440 with the small end pushrods and never had any problems.
     
  3. swisherred

    swisherred Active Member

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    I see...now that I look, the rockers are the same part number but the lifters arent. thank you for educating me on that. I know mine were bent at some point...not much, but enough the previous owner felt the need to straighten them from sticking lifters...I was told to replace them. I dont know if I truly need to or not.
     
  4. 413

    413 Member

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    I would think it would be a good idea to replace them. How did they bend? Usually from high rpm and the valves hitting pistons, or sticking valve guides. Well a 3832bbl shouldn’t have the valves hitting pistons because of the low compression and small cam profile. Also a 100,000 miles engine shouldn’t have sticking valve guides.
     
  5. swisherred

    swisherred Active Member

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    He said it was from the engine sitting for 30 yrs and the sludge caused them to bend some...I have no idea how bad, the car runs well enough I doubt they were damaged much...just enough that they wouldnt slide smooth from my understanding. I think from sticking valves.

    actually now that I think about it im sure he said from sticking valves.
     
  6. 413

    413 Member

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    Yes when they bend, then they are prone to bend again, and how straight are they! They may be OK. If he never told you you might never know what had happened. But I’d want to swap them out.
     
  7. swisherred

    swisherred Active Member

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    so what are you looking to get for them? Im planning on repainting the engine which mean removing the intake and gasket so i will already be in there.
     
  8. Ripinator

    Ripinator Senior Member

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    I bet the PO started the engine with shiddy gas still in the tank. Caused the valve stems to varnish up and stick, which caused the push rods to bind and bend.
     
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  9. detmatt

    detmatt Old Man with a Hat FCBO Gold Member

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    I’ve got a few sets of the ‘68 and later pushrods if Mr 413 doesn’t.
     
  10. swisherred

    swisherred Active Member

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    Exactly...
     
  11. Andrew Douglas

    Andrew Douglas New Member FCBO Gold Member

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    I did a rebuild on my 67 383 last year. Had a similar issue with lifter sizes and push rod lengths. I used a new comp cams cam 21-305-4 268/276 .464 lift. matching springs 926-16. with new comp cams lifters 824-16 and new comp cams push rods 7402-16 8.555. everything works well with the factory rocker arms. hope that helps
     
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