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Technical Differences In SBC's

Discussion in 'The Hokey Ass Message Board' started by Speed Gems, Mar 28, 2023.

  1. Lloyd's paint & glass
    Joined: Nov 16, 2019
    Posts: 10,428

    Lloyd's paint & glass
    ALLIANCE MEMBER

    Orange, blue, or black. And bore/ stroke lol. Mine are corvette pieces. Funny how that comes across as bragging ain't it? "That's a 350 out of a corvette", but in the mid 70's, that means it was a 170hp boat anchor that had a funky distributor :rolleyes:
     
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  2. I have actually owned 2 gennie corvette small blocks. I have sold several but only owned 2. :rolleyes:
     
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  3. Speed Gems
    Joined: Jul 17, 2012
    Posts: 6,856

    Speed Gems
    Member

    The crankshaft/rods must have the diameter journal then, maybe they'll fit you just have to weld that big gear on the crankshaft.
     
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  4. Speed Gems
    Joined: Jul 17, 2012
    Posts: 6,856

    Speed Gems
    Member

    And don't forget about the Volvo OMC Mercuiser engines. I've even seen a 3x2 manifold with slanted mounting pads for the carbs. I deleted the picture so I can't post it anymore.:rolleyes:
     
    Last edited: Mar 28, 2023
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  5. Speed Gems
    Joined: Jul 17, 2012
    Posts: 6,856

    Speed Gems
    Member

    The LG 327 in my '49 Chevy p/u has a steel crank in it.
     
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  6. 1952henry
    Joined: Jan 8, 2006
    Posts: 1,548

    1952henry
    Member


    Don’t know much about boats, but my dad had a 510 MF combine in the mid to late 70s. I remember him saying it had a 327. Didn’t know there was anything special about it. His had the dual straight pipes running out of the hood and along the grain tank. Made a joyful racket when started in the Quonset. When combining, if a slug went through, the governor would open her up and she barked. An uncle had a later 510 with the 350, and a 410 with the 292.
     
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  7. They are a pretty rare crank, since LG 327s only lasted 68 and part of 69. I have 2 of them sitting on the shelf waiting.
     
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  8. 26Troadster
    Joined: Nov 20, 2010
    Posts: 881

    26Troadster
    Member

    But the middle one was undrilled right?[/QUOTE]
    if i remember right no, one had two bosses and the other had three. i seem to remember one block being a tad thicker. it has been at least 32-33 years since i messed with the 400's, my old mind is not what it used to be. so take that with a grain of salt. when we looked for them that is what we looked for as well as we wanted 2 bolt mains, we ran them in what we called hogg cars on the round tracks.
     
    Last edited: Mar 29, 2023
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  9. Budget36
    Joined: Nov 29, 2014
    Posts: 15,028

    Budget36
    Member

    How long did GM make the small block 400? Personally, I’ve never seen one (or didn’t know if I did).
     
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  10. Speed Gems
    Joined: Jul 17, 2012
    Posts: 6,856

    Speed Gems
    Member

    From 1970 to 1980 IIRC with '70-'72 being the only years for the 4 bolt main.
     
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  11. Hollywood-East
    Joined: Mar 13, 2008
    Posts: 2,090

    Hollywood-East
    Member

    Every SBC, That has it's oilpan on, Is a 4 bolt main...
    Actual interesting fact, I had a 1955 6400 series truck, And the 265 was yellow!
     
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  12. 05snopro440
    Joined: Mar 15, 2011
    Posts: 2,851

    05snopro440
    Member

    My 1967 283 has the fitting for crankcase ventilation behind the intake manifold on the top of the block.

    I'm not sure which year that ended.
     
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  13. 1971BB427
    Joined: Mar 6, 2010
    Posts: 9,673

    1971BB427
    Member
    from Oregon

    I thought those motors didn't have the distributor hole in the intake? But did still have the same block as other post 1987 blocks. So if the intake and balancer is off the block they should look just like other non Opti-spark blocks, shouldn't they?
     
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  14. 327Eric
    Joined: May 9, 2008
    Posts: 2,201

    327Eric
    Member

    The LT block is different. My picture posted earlier was deleted because it showed the EFI, but is O.T. none the less. There is a gear in the back that drives the oil pump, and the block is the same under the manifold there, aside from the mounting boss for the pump drive, which looks like a distributo stub, for lack of a better description. A gm performance 4 barrel maifold can be purchased, and with some work a gen 1 manifold can be adapted, and a distributor run in the rear with a melonized gear. There is no water from the heads to the manifold. The front cover are is different due to mechanical water pump drive and reverse flow ports. A block off plate is available to eliminate the optispark. There is no way to run a traditional sbc water pump, balancer or accessory drive on one of these, in this respect it is completely different. It is an interesting, and odd beast. exhaust ports are different too. I wouldnt have messed with it, but Im a suckker for a running 150 dollar engine. it is my hoarder mentality.
     
    Last edited: Mar 29, 2023
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  15. DDDenny
    Joined: Feb 6, 2015
    Posts: 21,602

    DDDenny
    Member
    from oregon

    (In my quitest OT voice)
    I'll take your word on that, my wife locked the hood on her 96 Impala, said to keep my hands off this one!
     
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  16. 327Eric
    Joined: May 9, 2008
    Posts: 2,201

    327Eric
    Member

    a good place too leave it. The other reason I know this, I didnt want to give up my standard bore 66 327 for this build.
     
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  17. gimpyshotrods
    Joined: May 20, 2009
    Posts: 24,401

    gimpyshotrods
    ALLIANCE MEMBER

    What's a freeze plug?
     
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  18. squirrel
    Joined: Sep 23, 2004
    Posts: 59,230

    squirrel
    Member

    It's a core plug that popped out when the water in the engine froze.

    I've seen it happen.
     
  19. gimpyshotrods
    Joined: May 20, 2009
    Posts: 24,401

    gimpyshotrods
    ALLIANCE MEMBER

    And I have seen both sides of a V8 block blown out, without moving a single core plug, and all manner of other inline engines blown apart at the oil pan rails, also without disturbing a core plug.

    Forgetting to properly winterize your boat in New England has expensive consequences, none of which are prevented by calling something by the wrong name.
     
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  20. DDDenny
    Joined: Feb 6, 2015
    Posts: 21,602

    DDDenny
    Member
    from oregon

    Cripes, another "is it an engine or a motor" shtick!
     
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  21. Pass The Torch
    Joined: May 18, 2018
    Posts: 1,881

    Pass The Torch
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    What about "Fan Belt"...?
     
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  22. gimpyshotrods
    Joined: May 20, 2009
    Posts: 24,401

    gimpyshotrods
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    Except it is not.

    Engine, or motor, in both cases, they are a means of providing locomotion.

    Using one or the other does not imply any different outcome.

    That argument is much like the debate between hoagie, hero, Italian, grinder, wedge, or a spuckie. In any case, order one and you get a cylindrical bread roll split lengthwise and filled with meats, cheeses, vegetables, and condiments.

    Calling a core plug a freeze or frost plug creates the false implication of function. It implies that said function is to protect the object into which it has been installed from the damaging effects of the initial expansion of water when it freezes.

    They most certainly do not do that, nor were they ever intended to do that.

    You can call a pig a duck, but you will go to your grave before you hear one quack.
     
  23. gimpyshotrods
    Joined: May 20, 2009
    Posts: 24,401

    gimpyshotrods
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    Accessory drive belt.
     
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  24. Came across a pair of these in a junkyard; thought they were pretty weird until I learned they were from a combine with vertical exhaust.

    odd rams horn.jpg
     
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  25. Hollywood-East
    Joined: Mar 13, 2008
    Posts: 2,090

    Hollywood-East
    Member

    Yep... Been there!
    Drove a 59 apache back from TN., Western NY, started one morning an couldn't figure out the squeal , Yep..
    No antifreeze, game over..
     
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  26. 1952henry
    Joined: Jan 8, 2006
    Posts: 1,548

    1952henry
    Member

    They would make a unique cutout!
     
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  27. 1biggun
    Joined: Nov 13, 2019
    Posts: 891

    1biggun


    HMMMM vintage turbo looking set up .
     
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  28. Stogy
    Joined: Feb 10, 2007
    Posts: 26,916

    Stogy
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    That's seriously thorough Squirrel...perhaps the only thing I can throw in was some were blue...at least in Canada...but that was post Hamb cutoff I believe...:oops:...I see it's been mentioned...no surprise...I in the land of the know...;)

    The bolt holes for front motor mounts disappeared at some point or did they omit 1 and leave 3...I remember me and a friend either drilling a 4th or I might be mistaking that for bracket hole on the front of the driverside head...
     
    Last edited: Mar 29, 2023
  29. HEATHEN
    Joined: Nov 22, 2005
    Posts: 8,980

    HEATHEN
    Member
    from SIDNEY, NY

    I've seen later blocks with all or just some of the '55-'57 mount bosses drilled and tapped.
     
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  30. Pass The Torch
    Joined: May 18, 2018
    Posts: 1,881

    Pass The Torch
    ALLIANCE MEMBER

    My '65 327 was not drilled in the front for mounts.
     
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