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Technical 396 overhaul

Discussion in 'The Hokey Ass Message Board' started by squirrel, Dec 5, 2021.

  1. It’s not necessary, it’s usually because I pull the rod out of the heater and fumble with it and the pin to push it in, it seems like I always have to do it once.
     
  2. X-cpe
    Joined: Mar 9, 2018
    Posts: 1,982

    X-cpe

    Back in the day we used to press piston pins using two deep sockets. On the larger one that was used to support the piston, we ground the socket away to fit the pin boss on the piston. They are still rattling around in the top of my tool box.
     
  3. 57JoeFoMoPar
    Joined: Sep 14, 2004
    Posts: 6,147

    57JoeFoMoPar
    Member

    Cool thread. I honestly know next to nothing about the BBC, I've never really considered it to be a nostalgic engine and more like a muscle car engine. Not that there is anything wrong with that, especially for a custom that is going to leave the hood down. I had a 454 in a OT 95 Chevy K2500 I had with a plow on it, and it was a strong engine. I'm sure that big torque would be equally welcome in a big sled to pull all that weight around.
     
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  4. jaracer
    Joined: Oct 4, 2008
    Posts: 2,442

    jaracer
    Member

    A friend and car builder who ran sprint cars for over 30 years, always ran a reverse rotation cam. It did away with chain stretch and the gears lasted a long time. I ran a Pete Jackson setup with floating idler gears (not reverse rotation). After running in various engines for 10 years, they still looked like new.
     
  5. squirrel
    Joined: Sep 23, 2004
    Posts: 56,071

    squirrel
    Member

    Well, that worked pretty slick. I put a line of the temp crayon on the small end of the rod, and heated with the propane torch. I think it took about a minute to get the end of the line to go away. I heated a little longer, it just started to turn straw color, then I held the rod in place, and pushed in the pin, and then added a few drops of oil. Feels good, and the pin is centered. Only seven more to go. And I got the number stamp on the rod lined up with the outboard side of the piston, also.

    first rod.jpg
     
  6. Budget36
    Joined: Nov 29, 2014
    Posts: 13,257

    Budget36
    Member

    Nice. Did you just push the pin in by hand by hand on the drift I mean?
     
  7. Deuces
    Joined: Nov 3, 2009
    Posts: 23,907

    Deuces

    Nothing beats floaters with snap rings...;)
     
  8. Joe Travers
    Joined: Mar 21, 2021
    Posts: 708

    Joe Travers
    Member
    from Louisiana

    Throw the pins in the freezer......

    Joe
     
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  9. squirrel
    Joined: Sep 23, 2004
    Posts: 56,071

    squirrel
    Member

    Yup, it slides right in if you do it right. Just have to be quick and deliberate about it.

    There's no need to freeze the pins...I could heat the rod just a bit more, if I needed more clearance to get the pin in, but I don't. And I like to keep things simple.
     
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  10. X-cpe
    Joined: Mar 9, 2018
    Posts: 1,982

    X-cpe

    The simpler you keep things the less there is to screw up.
     
  11. Thanks for the picture of your jig. What temperature temp stick do you use?
     
  12. squirrel
    Joined: Sep 23, 2004
    Posts: 56,071

    squirrel
    Member

  13. Joe Travers
    Joined: Mar 21, 2021
    Posts: 708

    Joe Travers
    Member
    from Louisiana

    Glad you didn't get a hang up w/ a torch. Some cats set up their jig next to the beer box in the shop.....

    Joe
     
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  14. Dyce
    Joined: Sep 12, 2006
    Posts: 1,973

    Dyce
    Member

    My first BB was a 65 396 too. It came out of a scrap pile. It had a dent in the deck from something dropping on it. By the time I got done decking the block the piston all stuck .008 out of the hole! I ran it with tock felpro gaskets and never had trouble. With the closed chamber heads it was very responsive!!
     
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  15. I change rod and main bearings every two seasons depending on how much track time and miles are put on. I have never had a bearing problem to date.
     
  16. rod1
    Joined: Jan 18, 2009
    Posts: 1,324

    rod1
    ALLIANCE MEMBER

    Any progress?
     
  17. squirrel
    Joined: Sep 23, 2004
    Posts: 56,071

    squirrel
    Member

    No, I got distracted with another project....which has a deadline.
     
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  18. sunbeam
    Joined: Oct 22, 2010
    Posts: 6,220

    sunbeam
    Member

    I remember a story going around that L88 used the gear drive But I was only around one a 1967 Corvette. It had a chain a very stout stocker I saw it run a 12.7 on Firestone wide ovals
     
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  19. noboD
    Joined: Jan 29, 2004
    Posts: 8,483

    noboD
    Member

    Are we keeping secrets?
     
  20. squirrel
    Joined: Sep 23, 2004
    Posts: 56,071

    squirrel
    Member

    No, it's just off topic....53 MG TD. for an upcoming LeMons Rally.
     
  21. blowby
    Joined: Dec 27, 2012
    Posts: 8,661

    blowby
    Member
    from Nicasio Ca

  22. Dick Stevens
    Joined: Aug 7, 2012
    Posts: 3,716

    Dick Stevens
    Member

    You could take a few pictures of Almost Funny or Plan II with the MG in the background. :rolleyes:
     
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  23. squirrel
    Joined: Sep 23, 2004
    Posts: 56,071

    squirrel
    Member

    I have several pics with the opposite...

    and here's a piston/rod comparison....396 on the left.

    piston comparison.jpg
     
  24. rusty valley
    Joined: Oct 25, 2014
    Posts: 3,885

    rusty valley
    Member

    an MG TD would be on topic in my world
     
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  25. Very interesting picture of the two pistons and rods side to side. Kind of a Dr. Jeckel and Mr. Hyde kind of thing.
     
  26. upspirate
    Joined: Apr 15, 2012
    Posts: 2,299

    upspirate
    Member

    Some of the marine engines were reverse rotation for counter-rotating props in dual engine set-ups to even out the torque.
    Here is the only BBC I owned. .030 over 12-1 427. (Back in the 260 Sunoco days)
    Always wanted to see what it'd do in a car scan0004.jpg
     
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  27. 51504bat
    Joined: May 22, 2010
    Posts: 4,792

    51504bat
    ALLIANCE MEMBER

    I had a '50 MGTD with a flathead 60 when I got drafted in '71. Don't know if it would be considered OT or not. Still a fun car but the 60 didn't cut it performance wise. It got replaced with MGA running gear.
     
  28. Nostrebor
    Joined: Jun 25, 2014
    Posts: 1,282

    Nostrebor
    Member

    This made me LOL. Thanks for clarifying! :D
     
  29. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 6,257

    Ebbsspeed
    ALLIANCE MEMBER

    @squirrel I've been watching the MG progress on Instagram, looks like a fun little car.

    And to keep it on the thread topic, here's a close up of the BBC & MG rods posted by squirrel earlier in this thread. Do any of you worry about small nicks in connecting rods being the genesis of a stress fracture and eventual rod failure? I always smooth them out if I can without removing too much material. Rod Nicks.JPG
     
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  30. joel
    Joined: Oct 10, 2009
    Posts: 2,481

    joel
    ALLIANCE MEMBER

    Thanks, Jim, for a cool story. I've got a 396 in an OT Chevelle that will be going to my son soon. It's sat for a long time so a lot of work need to be done.
     
    Thor1 likes this.

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