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Fino's Sbc Build

Discussion in 'Builds and Fabricators Forum' started by FinoCJ, Sep 25, 2020.

  1. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    All 16 valves have been hand lapped....its mostly the #3 cylinder that is a problem in terms of getting decent valve seats. I feel like if I lap them anymore, I am going to cause a problem with the valves themselves. And I would possibly consider new exhaust valves...all the intake valves came out nice. But we are going to go with it as is....cleaned up and ran a tap through all the threads etc, and since I don't like painted gaskets, I am going to try painting as many of the pieces individually as I can each step of the way before assembly.
    [​IMG]

    after getting back from Moab next week, will try to re-assemble the valve train with new valve seals etc...then I can think about the bottom end (the timing chain looks pretty loose to me?).
     
  2. Jw60

    Jw60 That guy 2024 Sponsor 2023 Sponsor 2022 Sponsor

    When I did mine there was an audible difference once they were lapped. They would go from a ting to thump.
    Kinda hard to explain but Persian blue will tell it's true.
     
  3. Ohiowrangler

    Ohiowrangler Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    When you start replacing valves you need add more work. spring seat pressure, open pressure, installed height, spring stack clearance... If you want to go there, let the pro's do the work. Ron
     
  4. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    yup...once it starts, there is no reasonable place to stop until its all redone....so not going to start. it will run well enough as is....
     
    Fireball and Ohiowrangler like this.
  5. Ohiowrangler

    Ohiowrangler Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    I think that's a wise decision. For what you're doing, I believe you'll be fine. Ron
     
  6. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Finished putting the valves and springs back in the heads...guess I could put the rocker arms on now as well, but seems its much easier to access the head bolts for mounting back to the block without them...so about to put these aside for a bit and get the bottom end cleaned up and ready...

    I used these umbrella seals for intake valves:
    [​IMG]

    and these for the exhaust valves:
    [​IMG]

    Put o-rings on the second (lower groove) for all the valves, and then put the retainers in the upper groove with the help of a valve spring compressor:
    [​IMG]

    Finished up:
    [​IMG]
     
  7. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    So the question now...what are the next steps? Time to work on the block and bottom end.....I pulled the oil pan, timing cover etc....
    It is only a 2 bolt main:
    [​IMG]

    I am thinking I should pull the main bearing caps and take a look?....if those look ok, then leave the crank in place as well as the connecting rod, pistons etc...I'd like to replace the RMS of course....What to do with the oil pump?

    Here is the timing chain....Its the plastic/nylon coated gear teeth :n:...I guess my first thought was that is seems too loose? Have to research that.....
    [​IMG]
    [​IMG]
    [​IMG]

    No current intention to pulll the camshaft at this point, but I will inspect the lifters to see how much wear they show....I'd like to start degreasing and cleaning a bunch of the block, but am concerned about using the typical harsh cleaners with the camshaft and camshaft bearings in place?
     
  8. Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    The timing chain is definitely too loose. That needs to be changed. Get a new one with metal teeth (or a double roller chain). The plastic teeth are for noise reduction, but wear much faster.

    As for the bottom end, you should Plastigage the at least a couple of main bearings and a couple of rod bearings to make sure they're in decent shape.

    Since you said earlier your cylinder walls look good and have no taper, your rings are probably fine for what you're doing.

    A new oil pump is pretty cheap insurance and probably worthwhile.
     
  9. Ohiowrangler

    Ohiowrangler Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    What Fireball said. Ron
     
  10. Jw60

    Jw60 That guy 2024 Sponsor 2023 Sponsor 2022 Sponsor

    check for signs of ring issues but if the pistons are firm in the bore and the bore is true I think you're more likely to damage the rings if you pull the pistons just to look at them.
     
  11. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Is it possible to check the rod bearings without pulling the pistons?
     
  12. Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Yes, that's not a problem. Just pull the cap off when the piston is at the bottom of the bore. Remember the caps need to go back on the same rod in the same direction. They may or may not be marked already.
     
    CharlesC83 and FinoCJ like this.
  13. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

  14. Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    FinoCJ likes this.
  15. Warloch

    Warloch Did you say Flattie??? Staff Member

    My original plan was just to do a check on the bearings with a side thrust first, then pull and check caps.
     
  16. jackdog

    jackdog Member

    If your going to the trouble to pull caps and check why not put new in? Less than $50.
    Northern Auto Parts: Electronic Catalog
     
  17. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Got all the lifters out - that was little bit more of a pain than I expected....the bottoms were not mushroomed or anything (although at first I was worried) - just needed quite a lot of penetrating oil to free stuff up. The shape of the bottom of the lifters seems very nice - most seem like they haven't seen much wear at all. There are a couple that might be concerning as there is some corrosion on the bottom of the lifter - better to replace or leave as is?

    [​IMG]

    the bottom of #2 exhaust is the one that is most concerning....the dark is corrosion into the polished/chrome coating....
    [​IMG]
     
  18. Ohiowrangler

    Ohiowrangler Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    I would replace the cam and lifters. SBC cam kits aren't expensive. Follow the break in procedure, for low end torque/drivability I keep the lift under .500(cuts down on head work) and less than 300* duration. Just my opinion, Ron
     
  19. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    There are no flattened cam lobes...
    Considering the shape of the heads/valves, and no machine work being done to anything, I don't see how a new cam is worth it? Wouldn't new cam bearings need to installed by a shop as well? Remember, the plan here is basically buying a junkyard engine and just trying to get it to run for a bit.
     
  20. Ohiowrangler

    Ohiowrangler Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    You don't have to replace the cam bearings. Just my opinion, if the cam looks good, run it. Ron