Sbb 300 cracked exhaust.

Discussion in 'Small Block Tech' started by Nailhead Ronnie, Dec 2, 2018.

  1. Nailhead Ronnie

    Nailhead Ronnie Do the right thing.

    Was looking over a 300 i got in the wagon purcahse becasue im going to sell the engine and noticed a crack in the ex-manifold. And noticed that one valve cover was dented too.
    Do you think this engine fell or is the cracked manifold common?

    When i rotoate the engine @ the fly i also hear air escaping and all the spark plugs are in. 20181202_123919.jpg 20181202_123928.jpg 20181202_123935.jpg
     
  2. Aaron65

    Aaron65 Well-Known Member

    Cracked manifolds seem to be common on 300s. Mine had two previously repaired cracked manifolds when I bought it, and they both cracked again. I'm on manifold number 3 on the driver's side, but I broke an ear from the head pipe flange on the second one, so I don't know if that really counts as a crack.
     
    Last edited: Dec 2, 2018
  3. TrunkMonkey

    TrunkMonkey Well-Known Member

    Looks like sudden stop syndrome @ 32 ft/s2.

    upload_2018-12-2_18-40-40.png
     
    Last edited: Dec 2, 2018
  4. Nailhead Ronnie

    Nailhead Ronnie Do the right thing.

    I don't get it?
     
  5. Nailhead Ronnie

    Nailhead Ronnie Do the right thing.

    Thanks Aaron
     
  6. TrunkMonkey

    TrunkMonkey Well-Known Member

    Sorry. I have DSL and sometimes the images don;t upload if i hit "post" too soon.

    Has been a real b*tch lately. Posts take 5 minutes to hit the server, so sometimes someone posts similar response, then it looks like I came along and posted the same thing like some yutz.

    the 32 ft squared is terminal velocity of a dropped object.

    The image (that I re-posted) shows what looks to me, like impact of it being dropped and likely cracked the manifold.

    I have the complete 300/2bbl engine I pulled from my 1964 Skylark, so if you cannot find a manifold, let me know.
    Unlikely anyone wants the engine anyway, but I hate to break it up, although if it helps a brother out, who needs to by cools stuff for the little one...
     
    Nailhead Ronnie likes this.
  7. telriv

    telriv Well-Known Member

    Dented valve cover is probably from a chain lifting the engine which scratched the rear of the manifold also.
     
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  8. gstewart

    gstewart Well-Known Member

    crack can be repaired. U have to find a good welder who can weld cast.
     

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