Unpleasant surprise in 50 year old pan!

Discussion in 'Small Block Tech' started by 69WILD, Nov 5, 2021.

  1. Max Damage

    Max Damage I'm Working on it!

    Actually the copper spray discussion was about head gaskets, not intakes.
     
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  2. Mart

    Mart Gold level member

    I use all steel intake and head gaskets. Used them both dry (as GM suggests) and have sprayed them both with copper coat. No failures either way.
    Typical silicone outline around intake water ports, a bit heavier copper spray at head water ports.

    I thought this thread was about crap in the pan....:D:D
     
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  3. 69WILD

    69WILD Gold Level Contributor

    Anywho....my parts came today. Taking them to shop in the morning!
     

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    sean Buick 76 and FLGS400 like this.
  4. telriv

    telriv Founders Club Member

    I ALWAYS use studs on the intake. Install gaskets then intake. No moving around & guessing on a "nail"..

    Tom T.
     
  5. sean Buick 76

    sean Buick 76 Buick Nut

    Best of luck!
     
  6. 69WILD

    69WILD Gold Level Contributor

    Waiting on the silvolite pistons :rolleyes:
     
  7. 69WILD

    69WILD Gold Level Contributor

    Received pistons. 6 pack plus 2. The 2 additional shipped must be older because of slight corrosion and the number stamped on top is "30" and the others are "030" also the older ones piston pins don't slide freely like the other 6.
     

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  8. sean Buick 76

    sean Buick 76 Buick Nut

    I’m sure your machine shop could polish the piston pins a bit to allow smoother movement although once the engine is built the pins will stay virtually in the same place so I wouldn’t worry.
     
  9. 69WILD

    69WILD Gold Level Contributor

    Also disassembled heads and one valve stem is larger diameter-the one with the wiped lobe. Looks like tip of that valve stem was never touched by its rocker arm in at least 40 years. All the previous owners I contacted still say they don't remember ANY engine work.... Somebody forgot. :)
     
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  10. 69WILD

    69WILD Gold Level Contributor

    All valves have 3/8 stems except the larger one that was replaced apparently. So I guess machinist will have to put a guide in that one?
     

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  11. sean Buick 76

    sean Buick 76 Buick Nut

    What diameter is the stem on that one?
     
  12. Mart

    Mart Gold level member

    Have all the guides properly lined or sleeved so they are all in spec. New stem seals too.
     
    Last edited: Nov 26, 2021
  13. 69WILD

    69WILD Gold Level Contributor

    I'll have to check it w micrometer.
    Yes whatever the heads need.
     
  14. telriv

    telriv Founders Club Member

    Guides are cheap enough, just replace them. DON'T line or sleeve as they WILL fall out UNLESS properly retained.

    Tom T.
     
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  15. Mart

    Mart Gold level member

    I've had Steve Sánchez at Total Flow Cylinder Heads line mine in the past, no issues.
    Have a good cylinder head shop do the work.
     
  16. 69WILD

    69WILD Gold Level Contributor

    My cheap micrometer doesn't register the valve stem difference but a 3/8 wrench fits around 15 out of 16 valves. ......Don't see original guides. Looks like head is just machined for valves?
     
  17. Mart

    Mart Gold level member

    Stock iron heads don't have anything for liners or insert guides.
    They're all performance & aftermarket goodies.
    For a check, pull any stock valve out 1/2" from seat and wiggle it. You shouldn't detect much movement, as the guide to stem clearance should be very minimal.
     
    Last edited: Nov 26, 2021
  18. 69WILD

    69WILD Gold Level Contributor

    Should I replace motor mounts?
     

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  19. 69WILD

    69WILD Gold Level Contributor

    Looks like autozone 2281 $7.99 each!
     
    Dano likes this.
  20. sean Buick 76

    sean Buick 76 Buick Nut

    Yes I woukd replace them. Keep the old ones to ensure the new ones match.
     

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