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Cj2 with 4.3 vortec

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SeabeeDon View Drop Down
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    Posted: 08 May 2021 at 4:46pm
Couldnt find a reasonable engine, so I installed a 4.3 vortec from a 2011 gmc Sierra.  I also used a summett carb 500cfm and 2111manifold. My problem is it tries to idle at high speed. 2 mechanics changed intake gaskets and carb gaskets. With all vacuum ports closed, still have extremely high idle speed. Any ideas ?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nofender Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2021 at 5:06pm
Originally posted by SeabeeDon SeabeeDon wrote:

Couldnt find a reasonable engine, so I installed a 4.3 vortec from a 2011 gmc Sierra.  I also used a summett carb 500cfm and 2111manifold. My problem is it tries to idle at high speed. 2 mechanics changed intake gaskets and carb gaskets. With all vacuum ports closed, still have extremely high idle speed. Any ideas ?

I don't think that manifold is compatible with a later engine. Can you elaborate on the manifold? 

later Vortec engines don't like early Vortec things. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 48cj2a Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2021 at 8:13pm
Look at model 2114...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SeabeeDon Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2021 at 5:54am
I put incorrect number 2114 is what I have.
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