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Chevy 348 Build-Up

Discussion in 'The Hokey Ass Message Board' started by motor mikey, Nov 22, 2005.

  1. motor mikey
    Joined: Jul 17, 2002
    Posts: 261

    motor mikey
    Member
    from hanover pa

    I've noticed some guys here on the HAMB have been talking about the 348 Chevy engine. Currently I'm rebuilding a 348 for Hotrod 29 here on the HAMB. I figured this would be a perfect time to show a total rebuild to help some guys out that maybe unsure of these engines. The pics were taken after the engine was tore down. I will post pics as I go, but right now the block and heads are at the machine shop, so it will a little bit until I get it back.
     
  2. motor mikey
    Joined: Jul 17, 2002
    Posts: 261

    motor mikey
    Member
    from hanover pa

    You can see that the block is mix of BB and SB. The mains look similar to the early BB's but they use a different main bearing. Rod bearings are BB so that saves some cash because the mains aren't cheap. You can see also that the deck is not at a 90 to the bores like most engines. The combustion chamber is located in the block itself, not in the head like a SB,BB design. Overall these engines are pretty basic, nothing too scary. Plans for this block is a .030 over bore and a .010 turn on the crank, which is forged.
     
  3. motor mikey
    Joined: Jul 17, 2002
    Posts: 261

    motor mikey
    Member
    from hanover pa

    Dude wheres my pictures?
     

    Attached Files:

  4. Thirdyfivepickup
    Joined: Nov 5, 2002
    Posts: 6,085

    Thirdyfivepickup
    Member


    That's what I said! I'll be following this one. Thanks!
     
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  5. motor mikey
    Joined: Jul 17, 2002
    Posts: 261

    motor mikey
    Member
    from hanover pa

    The pistons have a unique shape to them as well. The one half matches the angle of the deck while the other side is angled for the combustion chamber. They are heavy as shit, no wonder these things have a hard time turning rpms. If you look at the head you can see there is no chamber just the valves.
     

    Attached Files:

  6. Fifty5C-Gas
    Joined: Sep 1, 2003
    Posts: 1,424

    Fifty5C-Gas
    Member

    kool...im happy to see the process...cant wait to run this thing next year...thanks,mike
     
  7. scarylarry
    Joined: Apr 24, 2001
    Posts: 2,497

    scarylarry
    Member

    I cant wait for the Ford 2300 build!
     
  8. Southfork
    Joined: Dec 15, 2001
    Posts: 1,412

    Southfork
    Member

    Hey, thanks for doing this build-up post! I too will be most interested in following it.
     
  9. fatty mcguire
    Joined: Dec 5, 2004
    Posts: 1,088

    fatty mcguire
    Member

    lol there was lint in the motor
     
  10. BigChief
    Joined: Jan 14, 2003
    Posts: 1,886

    BigChief
    Member

    Don't tempt me. We do alot of them for hydroplanes. THEY COOK if done right.

    -Bigchief.
     
  11. Rolf
    Joined: Jul 23, 2002
    Posts: 1,828

    Rolf
    Member

    Mikey,

    A 348 followed me home the other day, I have a 283 powered 58 Chebby that will welcome a W-motor.

    Thanks for doing this, I will follow along...
     
  12. motor mikey
    Joined: Jul 17, 2002
    Posts: 261

    motor mikey
    Member
    from hanover pa

    Larry I think I can mate two of those 2300 together in a V shape, what do you think?
    A heads up on these engines. When you are running a stock cast 9.5 to 1 piston, you are limited on cam choices. You will run into piston to valve problems with cams over .460 lift. Something to keep in mind.
     
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  13. Fifty5C-Gas
    Joined: Sep 1, 2003
    Posts: 1,424

    Fifty5C-Gas
    Member

    yes, they use the same motor mounts..its a direct bolt in.
     
  14. Rolf
    Joined: Jul 23, 2002
    Posts: 1,828

    Rolf
    Member

    Bolt in = GOOD ! After three years of building the model A hot rod, (still not done) bolt in sounds kinda good !

    Yeah, it will be cool to stir around in a 4 speed, just like Bolander (and Toad)
     
  15. sixpac
    Joined: Dec 15, 2002
    Posts: 545

    sixpac
    Member
    from Courtenay

    I have a 348 tri power in my 28 sedan. I love it it sounds awesome and is definatly cool. Oh and and it pulls nice and hard with about 320 hp. And its not a small block. These w engines have lots of potential for power and lots of torque. There is a 348/409 site on the net www.348-409.com tons of info and conections for parts. John
     
  16. igorw
    Joined: Jun 17, 2005
    Posts: 191

    igorw
    Member

    I was a little concerned about valve/piston clearance with 9.5 to 1 pistons (which is what I'm using in mine) and e-mailed Curt at CH Enterprises about the issue and this is his reply:



    The 348 350hp cam only had a lift of just over .400 and the problem is not with lift--at full lift the piston is near the bottom of its travel--but with duration and when the valve starts to open and when it closes. The piston is closest at low lift within 10 degrees of top dead center. The more duration--and cams with a lot of duration usually have more lift and that is what confuses people--the more problems and the closer the lobe separation the more problem. A cam with 270 duration @.050 and lobe centers of 106 with 500 lift would be worse than a cam with 220 duration and 114 lobe centers with .750 lift.The 9.5 piston has no intake valve clearance at about 225 duration and 110 centers. we normally use about 220@.050 on 110 which is a cam of near .500. The Isky 270 hydraulic would be about as big as you can go. The most populalr is the 262 hydraulic with .488 lift--no problems

    Curt
     
  17. Fifty5C-Gas
    Joined: Sep 1, 2003
    Posts: 1,424

    Fifty5C-Gas
    Member

    the biggest cam you can go with, with stock pistons is .225 duration @ .50
     
  18. motor mikey
    Joined: Jul 17, 2002
    Posts: 261

    motor mikey
    Member
    from hanover pa

    There is not a exact answer to which cam will fit. There are alot of factors like: lift, duration, lsa, which will affect this valve to piston clearance. You must also take into account things like: If the block is decked, head milled, oversize valves, and head gasket thickness. When I said that over .460 lift you may have problems, it was taking all these factors into account. You can have more lift and duration but you will have to check the clearances. By the way, Mike, I was at the machine shop on Wednesday, your block and heads were cleaned and stripped, looked like new.
     
  19. Larry T
    Joined: Nov 24, 2004
    Posts: 5,729

    Larry T
    Member

    You can always notch the pistons for valve relief, not a big deal.
     
  20. motor mikey
    Joined: Jul 17, 2002
    Posts: 261

    motor mikey
    Member
    from hanover pa

    Thats what we don't want to do.
     
  21. Larry T
    Joined: Nov 24, 2004
    Posts: 5,729

    Larry T
    Member

    I'm curious as to why you wouldn't want to flycut the pistons, Ross pistons come with the valve relief cut in them.
     
  22. Fifty5C-Gas
    Joined: Sep 1, 2003
    Posts: 1,424

    Fifty5C-Gas
    Member

    KOOL!!!!!
     
  23. motor mikey
    Joined: Jul 17, 2002
    Posts: 261

    motor mikey
    Member
    from hanover pa

    We are talking about what cam will fit with the stock type piston. If you would read the post, you would see that. Give it a rest, ok. I'm trying to have a post that helps people out, not argue on how to put this engine together.
     
  24. Larry T
    Joined: Nov 24, 2004
    Posts: 5,729

    Larry T
    Member


    I usually like to know all of the options when I put an engine together.

    Anyway, you've got it, I'm done.

    Larry T

    BTW, here's the last w engine I put together for a customer.
     
  25. CURIOUS RASH
    Joined: Jun 2, 2002
    Posts: 9,642

    CURIOUS RASH
    Classified's Moderator

    I agree with Mikey. I'm digging on this post because I just aquired a 348 that I'm sure I will break and it will be nice to know how to rebuild it witha minimal amount of wear and tear on myself and my wallet.

    I'm a bit tired of seeing people trying to share what they know just to have the thread turned into a pissing match as to who knows what.

    Feel free to start another thread about fly cutting pistons and what cam will fit what and let Motor Mikey get on with what he is trying to say.

    Let the rest of us decide if his information is the right fit for ourselves or not.

    Thanks,

    RASHY
     
  26. Fifty5C-Gas
    Joined: Sep 1, 2003
    Posts: 1,424

    Fifty5C-Gas
    Member

    yeah larry, there are alot of options when you sart spending serious money, but mikey isnt putting ross pistons, or fly cutting my pistons...you can also stroke the motor and make it 400+ cubes, but thats not what were talking about here, were talking a decent h.p. motor on a budget.
     
  27. Gambino_Kustoms
    Joined: Oct 14, 2005
    Posts: 6,557

    Gambino_Kustoms
    Alliance Vendor

    cool, thanks for posting the pics
     
  28. igorw
    Joined: Jun 17, 2005
    Posts: 191

    igorw
    Member

    Motor mikey, didn't mean to step on your toes on this thread. My apologies.
     
  29. motor mikey
    Joined: Jul 17, 2002
    Posts: 261

    motor mikey
    Member
    from hanover pa

    Nobodys stepping on my toes. I just wanted to keep it simple for everyone. That way maybe someone who was a little scared to try a rebuild, will have some confidence in trying to put one of these engines together. No hard feelings.
     
  30. Paul
    Joined: Aug 29, 2002
    Posts: 12,236

    Paul
    Editor

    it would be cool to see this thread as a "tech" thread
    and added to the archives.

    the chance of it getting there is unlikely if it becomes a battle.

    we all know there is more than one way to do anything.

    I would like to see this one.
    please continue
     

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