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Chevy 230 to 250 Conversion

Discussion in 'The Hokey Ass Message Board' started by 66miles99, Oct 16, 2010.

  1. 66miles99
    Joined: Sep 14, 2010
    Posts: 295

    66miles99
    Member
    from Canada

    So I've just acquired a 63 chevy 230, runs well no blue but I'm thinking a rebuild anyways, can't hurt right? So why rebuild when you can upgrade is what I'm thinking. So if I purchase a 250 rebuild kit with pistons and a 250 crank am I there, something I'm missing or am I way off base here?
     
  2. squirrel
    Joined: Sep 23, 2004
    Posts: 55,933

    squirrel
    Member

    It would probably work....I'd want to get the thing balanced though.
     
  3. forty1fordpickup
    Joined: Aug 20, 2008
    Posts: 298

    forty1fordpickup
    Member

    Does the kit include rods? 230 and 250 are different lengths.
     
  4. squirrel
    Joined: Sep 23, 2004
    Posts: 55,933

    squirrel
    Member

    are you sure about that? They have different pistons with different pin height, but the same bore
     

  5. forty1fordpickup
    Joined: Aug 20, 2008
    Posts: 298

    forty1fordpickup
    Member

    You are probably right. It's been a real long time since I've played with any inline sixes. I do remember changing rods to go with the increased crank throw. It may not have been the 230 to 250 conversion. CRS is kicking in.
     
  6. rjaustin421
    Joined: May 1, 2009
    Posts: 337

    rjaustin421
    Member

    The rods are the same, longer stroke & shorter piston pin height make it all work.
    If you have a triple beam scale & want to save money on the balance get the rods & piston/ring assembly the same weight and just send the crank/damper & flywheel or flex plate to be balanced. You can do that with an inline engine.
     
  7. bob308
    Joined: Nov 27, 2009
    Posts: 220

    bob308
    Member

    all you need is a 250 crank and pistons. for your 230 block.
     
  8. Jethro
    Joined: Mar 5, 2001
    Posts: 1,908

    Jethro
    ALLIANCE MEMBER

    You can use 283 pistons with the 230 and 307 pistons for the 250, same rods for both.
     
  9. Just glad you are keeping the 6 in it !
     
  10. 66miles99
    Joined: Sep 14, 2010
    Posts: 295

    66miles99
    Member
    from Canada

    So recap, Pistons from 250 kit will work, connecting rods are same length so that doesn't matter?yes/no Crank from a 250 is right too, ballance required possibly?
    Maybe this isn't such a good idea, sounded on other posts like an easy swap but...
     
  11. Dzus
    Joined: Apr 3, 2006
    Posts: 321

    Dzus
    Member

    It's still a good idea, that little six can use every extra quarter inch of stroke it can muster.

    The 230-250 rods are the same length, and you've got a set that have been swinging together for the last 40 years. Not hard to balance.
     
  12. 66miles99
    Joined: Sep 14, 2010
    Posts: 295

    66miles99
    Member
    from Canada

    So I found this kit and a used crank from a 250. I'm surprised that a block from 63 can interchange parts designed for a 71, no changes at all made in a decade?
     
  13. squirrel
    Joined: Sep 23, 2004
    Posts: 55,933

    squirrel
    Member

    It's a chevy, not a ford.

    The same manual transmission pilot bushing for Chevys fits from 1937 into the 1980s.

    350 crank is the same from 1967 to 1986
     
  14. 66miles99
    Joined: Sep 14, 2010
    Posts: 295

    66miles99
    Member
    from Canada

    I'm not sure I understand your post
     
  15. squirrel
    Joined: Sep 23, 2004
    Posts: 55,933

    squirrel
    Member

    You asked, "no changes at all made in a decade?"

    My answer was "NO", although I forgot to say that....and I provided some examples of long production runs of parts in Chevys, and also mentioned that it's not a Ford, as Ford had a habit of coming out with a new engine design every few years, making it hell to swap parts.
     
  16. 29nash
    Joined: Nov 6, 2008
    Posts: 4,544

    29nash
    BANNED
    from colorado

    Yep.
     
  17. Squablow
    Joined: Apr 26, 2005
    Posts: 17,388

    Squablow
    Member

    If it runs good, why would you want to spend the money to rebuild it? If it was me, and I wanted to build a hotter inline 6, I'd find a good running 292 and start from there. You should be able to find a good one that doesn't need a rebuild for $200 or less.

    Just seems like a huge waste to me to spend all that time and money and effort to build up a 230.
     
  18. Gizzy
    Joined: Jan 20, 2008
    Posts: 761

    Gizzy
    Member
    from N.W,Ohio

    I've got a 64' Belair,I talked to Tom Langdon about the 292 swap in mine too.According to Tom the 292 is a taller block height & won't fit under a 63/64 hood without dropping the motor down lower in the frame(lots of work).He suggested a 250. Giz'
     
  19. MrFalcon62
    Joined: Sep 9, 2010
    Posts: 249

    MrFalcon62
    Member

    Why not keep the 230, and put lots of carbs on it?
     
  20. 66miles99
    Joined: Sep 14, 2010
    Posts: 295

    66miles99
    Member
    from Canada

    Ah, I get it now. Just lost me there for a minute, makes sense now.:D

    I do plan on running a dual carb on it for I'm guessing it will get me 15 HP? Figured if I opened it up for a rebuild $50 for a used crank on top of the $$ for the rebuild kit I was already doing would get me another 15hp so why not.
     
    Last edited: Oct 17, 2010
  21. hoggyrubber
    Joined: Aug 30, 2008
    Posts: 572

    hoggyrubber
    Member

    a 230 with lots of carbs might not run as well as the stock one.
     
  22. 66miles99
    Joined: Sep 14, 2010
    Posts: 295

    66miles99
    Member
    from Canada

    The carbs are half the size if thats what you are thinking the net result is aprox the same cfm serviced but in a more uniform fashion...and the cool factor is ten fold IMO.

    Tom at Langdon's is the brains behind that situation though, I'm going with whatever he suggests.
     
  23. 29nash
    Joined: Nov 6, 2008
    Posts: 4,544

    29nash
    BANNED
    from colorado

    Properly set up, adjusted, and jetted right, any motor runs just as well with 'lots of carbs' as with one stock carb. Sometimes, BETTER. And that's what hot roddin' is all about.:D
     
  24. MrFalcon62
    Joined: Sep 9, 2010
    Posts: 249

    MrFalcon62
    Member

    i put 3 carbs on my 200, and it beats the shit out of a stock one!

    of course, it required a lot of fine tuning and rejetting

    but, WELL worth the time!
     
  25. hoggyrubber
    Joined: Aug 30, 2008
    Posts: 572

    hoggyrubber
    Member

    quoted 3 times in a row i feel honored.:D i was just saying a lot of people like to throw on a bigger carb or more carbs and the results are not what they wanted. if you are getting advice from the stovebolt engine co you are getting the best around so, yea, go for it. it certainly means much more than what i could give. and yes if your engine has a high lift can, lump port head, and larger valves installed you def need more carb! sometimes the cool factor can be more of a hassle like tuning multi carbs on a stock engine. but that's not saying you shouldn't do it. it's just the simpltons like myself are happy when something just works right. good luck on your six!
     
  26. 29nash
    Joined: Nov 6, 2008
    Posts: 4,544

    29nash
    BANNED
    from colorado

    If I had a 230 the only things I'd do to it would help it breathe better with carburetor-thrice and split exhaust. Use the same setup as on my 292 except replace the Monojets with Pot bellies. :D
    292 velocity stacks on monojets.jpg
     
  27. 66miles99
    Joined: Sep 14, 2010
    Posts: 295

    66miles99
    Member
    from Canada

    So with the hood closed those bad boys stick right thru the top?
    I like that look a lot, but not much in the way of a air cleaner is there?
     
  28. 29nash
    Joined: Nov 6, 2008
    Posts: 4,544

    29nash
    BANNED
    from colorado

    carb intake pipes 3.jpg

    Air cleaner; Two pieces of screen with filter sandwiched in between in each tube. Mesh small enough to keep out big rocks, birds, and such.:D
     
  29. 66miles99
    Joined: Sep 14, 2010
    Posts: 295

    66miles99
    Member
    from Canada

  30. 66miles99
    Joined: Sep 14, 2010
    Posts: 295

    66miles99
    Member
    from Canada

    Well go out to the truck today and did a compression test, runs fine no blue and all that but, 120,110,110,110,120,120. So I guess that would confirm the rebuild, you all had me thinking I was throwing cash away but turns out it in the end its time for the old girl.
     

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