Register now to get rid of these ads!

Technical SBC 5.7 Rods

Discussion in 'The Hokey Ass Message Board' started by 1Nimrod, May 2, 2019.

  1. 1Nimrod
    Joined: Dec 11, 2018
    Posts: 107

    1Nimrod

    My friend is building a SBC 327-LJ using a 1974 3970010 4bm block. He bought some new after market connecting Rod's 5.7 and asked me the correct why to put them on the crank but I don't know because they look nothing like a stock GM rod and I can't tell what part goes to the outside of the crank so I told him I'd ask you folks. I took pictures of the Rod's they are full floating Rod's on I think Speed Pro flat top pistons with One side only valve relief. I told him not to assemble the engine until I found out about the Rod's. All information and help is very much appreciated.
    1Nimrod
     

    Attached Files:

    Last edited: May 2, 2019
    Deuces likes this.
  2. Mike VV
    Joined: Sep 28, 2010
    Posts: 1,392

    Mike VV
    Member
    from SoCal

    Just like ALL rods (that I know of...), simple.
    The larger chamfer in the big end goes toward the crank shaft (NOT the mating connection rod).

    Mike
     
    X-cpe, 1Nimrod, Chucky and 2 others like this.
  3. 1Nimrod
    Joined: Dec 11, 2018
    Posts: 107

    1Nimrod

    Mike; So the second picture of the rods above goes toward the outside? And the smaller rod chamfer touches the other rod on the inside?
     
    Last edited: May 20, 2019
    Deuces likes this.
  4. The small end goes to the piston and the big end to the crankshaft. Couldn't help myself.
     
    Register now to get rid of these ads!

  5. jimmy six
    Joined: Mar 21, 2006
    Posts: 4,137

    jimmy six
    ALLIANCE MEMBER

    Yep. Make sure you have the correct side clearance by putting the pair of bare rods with bearing on the correct journal and measuring with a feeler gauge. It's a pain to correct after pistons are on the rods and installed in the block. Way easier before you put it all together and then remember. I mark everything with a felt pen while doing pre-assembly and note book while real assembly for torquing etc>Good luck
     
    Deuces and 1Nimrod like this.
  6. badvolvo
    Joined: Jul 25, 2011
    Posts: 332

    badvolvo
    Member

    please take them to your local machine shop and have them sized, they won't be correct out of the box.
     
    Deuces and 1Nimrod like this.
  7. 1Nimrod
    Joined: Dec 11, 2018
    Posts: 107

    1Nimrod

    I will tell him your advice about going to the machine shop and to gauge the clearance. I thank you all for your help and advice, even you anothercarguy it's always tempting isn't it... Y'all keep up the good advice. Thank You.
    1Nimrod
     
    anothercarguy, badvolvo and Deuces like this.
  8. I usually buy a nice set of Scat rods and whatever piston and let my builder sweat it out. He goes through everything anyway.
     
    Deuces likes this.
  9. Jmountainjr
    Joined: Dec 29, 2006
    Posts: 799

    Jmountainjr
    ALLIANCE MEMBER

    Like others have said, the narrow flat sides go against each other. That's just half of the equations. The pistons have to be assembles onto the rods in the correct orientation as well depending on which cylinder they go in.
     
    Deuces likes this.
  10. buffaloracer
    Joined: Aug 22, 2004
    Posts: 752

    buffaloracer
    Member
    from kansas

    I think you should be referring to picture 4. second picture in row 2. the camfer should go outside against the crankshaft radii. Smooth to the inside.
    Pete
     
    X-cpe, 1Nimrod and Deuces like this.
  11. buffaloracer
    Joined: Aug 22, 2004
    Posts: 752

    buffaloracer
    Member
    from kansas

  12. 1Nimrod
    Joined: Dec 11, 2018
    Posts: 107

    1Nimrod

    buffaloracer; Yes I believe you are correct Pete. After looking at the Rod's closer #4 picture that had the dot on the rod has the biggest chamfer and #2 is the smooth side with a very small chamfer. The #4 side with the dot like you said goes to the outside towards the crank and the #2 side goes to the inside towards the other Rod. Thank you Pete for looking much closer and helping me to look closer at my pictures and making the right choice for my friend. Your help is very much appreciated.
    1Nimrod
     
    X-cpe likes this.
  13. Looks like they been ground for camshaft clearance, stroker application.
     
  14. 1Nimrod
    Joined: Dec 11, 2018
    Posts: 107

    1Nimrod

    Algoma56; Yes i see what you mean.
    1Nimrod
     

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2020 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.