305/350 carb swap?

Discussion in '1973-1987' started by 84blueboots, Feb 28, 2004.

  1. 84blueboots

    84blueboots Member

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    Jun 6, 2003
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    Location:
    Ottawa USA
    The 305 in my 84 sierra seized,:( so I replaced it with a 350 out of a 79 chevy van. The mechanic set the idle high because it has a habit of dying at a low idle. The carb on the 305 was always smooth as silk. Would it work as a direct swap to put the Rochester carb off of the 305 onto the 350.

    Thanks in Advance!

    Turner the KS Kid

    '84 GMC Sierra Classic
    350 w/ 700R4 OD
     
  2. bigd

    bigd Member

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    Feb 21, 2004
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    winnipeg canada
    Yes it does bolt right on just make sure you install a new base gasket and check all your vac lines for cracks.
     
  3. 84blueboots

    84blueboots Member

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    Sounds easy enough. Do carb bolts need to be torqued at all, or just snugly tight with a socket wrench?

    Thanks!

    Turner the KS Kid
     
  4. lowrollin70gmc

    lowrollin70gmc Member

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    Feb 25, 2004
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    SF
    I just snug mine with a wrench, cause if they break, it sucks. Also, the gasket isn't under a huge amount of pressure to promote leaks, so cranking on the bolts is useless anyways.

    Make sure to give pics of the new motor.
     
  5. 84blueboots

    84blueboots Member

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    Thanks! I think I'll pull the truck into the ag. shop at school when I've got all of my class work done and do that switch. Shouldn't take over an hour and a half, should it?

    Pics of the 350 wouldn't be anything to look at... It's grimy as they come and just red-necked in there, nothing fancy at all. So long as she runs good, I don't care!

    Thanks for your help!

    Turner the KS Kid

    '84 GMC Sierra Classic
     

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