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Joe71topless

Old Mar 11, 2015 | 01:47 PM
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I have a 71 vette 350 auto had engine rebuilt machine shop in Sayreville nj. This was done in 07 .car shook the rebuilder said it was carb .i had carb rebuilt .still ran crappy.machine shop still said it was carb .i took carb back 2 more times.no good.car sat in garage .finnaly did compression test.valves were bad had second valve job done.new over size valves and new springs put heads on. Started car ran same.bought new carb from summit racing.put it on it ran same .put new wires cap roter .points have protronics.still ran same.very hard to keep running.and engine smells like gas Carbon when I start it in garage any body have an idea.thanks joe.vaccume is between 8 and 12

Last edited by joe71topless; Mar 14, 2015 at 10:47 AM. Reason: More info.
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Old Mar 11, 2015 | 02:19 PM
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did you do a compression test after reinstalling the heads?
what carburetor did you buy from Summit?
what is your initial timing set for? what is your total mechanical advance set for?
did you check for a vacuum leak around intake manifold to head and carburetor to head?
what camshaft do you have?
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Old Mar 11, 2015 | 02:21 PM
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Originally Posted by joe71topless
I have a 71 vette 350 auto had engine rebuilt machine shop in Sayreville nj. This was done in 07 .car shook the rebuilder said it was carb .i had carb rebuilt .still ran crappy.machine shop still said it was carb .i took carb back 2 more times.no good.car sat in garage .finnaly did compression test.valves were bad had second valve job done.new over size valves and new springs put heads on. Started car ran same.bought new carb from summit racing.put it on it ran same .put new wires cap roter .points have protronics.still ran same.very hard to keep running.and engine smells like gas Carbon when I start it in garage any body have an idea.thenks joe
Hi Joe
I am far from being an expert, but from all the work you have done and nothing has helped. I was wondering if the builder got the cam timing way off? Hope someone can help you with the problem.
Larry
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Old Mar 11, 2015 | 06:21 PM
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Originally Posted by MelWff
did you do a compression test after reinstalling the heads?
what carburetor did you buy from Summit?
what is your initial timing set for? what is your total mechanical advance set for?
did you check for a vacuum leak around intake manifold to head and carburetor to head?
what camshaft do you have?
I bought a jet carb quadrajet 35001 new.the timing was set for 4 degrees befor top dead center.but wants to run way edvanced.i did check for leaks. I even changed intake from the original to edelbrock .the engine is hard to keep running shaks till it stalls.cant put in gear .stalls out.thanks for your input joe
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Old Mar 11, 2015 | 07:58 PM
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How old is your gas?
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Old Mar 11, 2015 | 08:17 PM
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Valves too tight? Try backing off on the rocker nuts and see if that helps.
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Old Mar 12, 2015 | 03:49 PM
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Check the valve timing with a degree wheel. The cam could be installed off by a tooth or two.
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Old Mar 12, 2015 | 04:05 PM
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Did you check the plug wires and firing order?
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Old Mar 14, 2015 | 10:52 AM
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Originally Posted by Raphiki
Did you check the plug wires and firing order?
Yes many times.new wires cap plugs.vaccume is 8 -12 can't get any more
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Old Mar 14, 2015 | 10:58 AM
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Originally Posted by dochorsepower
Check the valve timing with a degree wheel. The cam could be installed off by a tooth or two.
We r going to check timing with a degree wheel .also vaccume is 8-12 that's the most we get.i think normal is 20-21 thanks 4 your input.joe
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Old Mar 14, 2015 | 11:03 AM
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Originally Posted by Mick71
Valves too tight? Try backing off on the rocker nuts and see if that helps.
We checked that .im thinking we need to. Degree wheel the cam timing. Also vaccume is 8-12
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Old Mar 14, 2015 | 12:09 PM
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the timing was set for 4 degrees befor top dead center.but wants to run way edvanced
4* is not nearly enough timing. Set it to 14* to 18* of initial. See what happens then.

I bought a jet carb quadrajet 35001 new
There are no new Q-jets. As stated by Lars, if you bought a commercially rebuilt Q-jet then it is likely junk in it's present condition. It will need to be built by someone like Lars or you need a different carb.
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