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305 balancer on a 350?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Timmer_71, Sep 16, 2002.

  1. Timmer_71

    Timmer_71 Registered Member

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    What would happen if i put the balancer off of a '86 305 on to my '71 350? It will fit and looks about the same size (diameter), but I just am not sure if it is safe. Anyone do this before? or is it a bad idea.
     
  2. Sandman

    Sandman 3/4 ton status Author

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    If it fits, you should be fine. You can't use from from a 400. But the other small-blocks are interchangeable.
     
  3. R72K5

    R72K5 Banned

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    yes it will fit on and everything, but there is a reason why the 350 one is narrower yet larger diameter, (8")

    why do you want to do that ?
     
  4. Blue85

    Blue85 Troll Premium Member

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    You should look at how the timing marks correspond to the keyway. My truck originally had a 305 and I think that when the 350 was dropped in, the original damper was used, although it is the larger diameter. I think the smaller is 6 1/2" and the larger is 8". In my case it may be a older/newer issue and not a 305/350 issue. Anyway, my timing mark is in the wrong place so I had to put on some timing tape in the right location.

    I think I read that either the larger or smaller one is good for high-rpm, but the other is not. I don't really know, but all small-blocks interchange the damper except the 400. The difference is internally balanced vs. externally.
     
  5. Timmer_71

    Timmer_71 Registered Member

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    Thanks guys, The reason I want to put the 305 balancer on my 350 is cause I wrecked the original pulling it off and I happen to have this one from the 305 just lying around, So being the tight-ass that I am I wanted to use this one so I don't have to spend any money.
     
  6. bablazer73

    bablazer73 1/2 ton status

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    there are 3 different sized small block balancers, but my books show that all 69 and later smallblocks (except 400) can use the same balancers. some of the 305's used a different timing mark. as long as you make sure that the marks are the same, or remark the balancer as needed, you will be fine. I know this was years ago, but i used to get the LT-1 balancers from gm for 40.00. I don't know what current price is, but it is a bigger balancer(absorbs more vibration) GM prt#12555879
     
  7. Mr.Chevy4x4

    Mr.Chevy4x4 1/2 ton status

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  8. bablazer73

    bablazer73 1/2 ton status

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    DAMN!!! for the little xtra money I would by a fluidampner!!
    well it has been 10 years since I bought one!! I am just getting old!!
     
  9. Z3PR

    Z3PR Banned

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    I'd go Fluidamper, or TCI Rattler.
     

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