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Old January 31st, 2013, 04:15 AM
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FetchMeAPepsi FetchMeAPepsi is offline
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Truck: 1962 4x4 GMC CECILIA
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Default Re: 1962 GMC 305V6 4WD Slow DD Build - Cecilia (Pic Heavy)

This one looks better.




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The block goes on top of that gasket.




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Then another gasket to seal it to the intake manifold.




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Now flip it back to where you can see the mixture screws pictured below. There are two, one on each side of the float bowl.


Put your screwdriver in one of them and hold it very loosely. This is so that you can tell when it gets lightly seated (snug, not tight!). Now turn it clockwise and COUNT the turns, quarter turns, or half turns etc. as you tighten them. REMEMBER THIS NUMBER. Write it down if you need to.

(This picture was taken after remounting b/c I forgot to reset them myself while it was off)


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Once they're very lightly snug you now need to back them out again to set them. I was talking to an old timer about it and he said this:


Gently seat the Idle Mixture Screws again like you did before (tighten them till they're just barely seated). Now unscrew them two full turns. Start the engine and make sure the choke is wide open. Turn each screw in 1/2 turn at a time until the engine rpm starts to drop. Then back them both out equally until you reach the highest rpms possible. LEAVE THEM THERE.

Idle Screw: Now just adjust the idle screw (by the spaghetti near the choke cable) till it's where you want the RPMs to be. That's it. Purrs like a kitten.


I'd trade the entire internet for a handful of old timers with great stories.




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That is how they should be set for life. Forget they exist now. Unless it runs like crap afterward, then go back to what they were and see if that fixes it. You remember what they were, right? You wrote it down.
I just know you did.




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At this point we can move back to the engine bay. The end is in sight!
Remove the rag you put in the intake now. Be sure to jerk it straight up so as not to knock something off of your dirty engine into the intake.




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Then place your first gasket, your block (if you have one), and your second gasket (again, if you had a block) on the bolts and line them up.




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Set the carb down on it's new perch.




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Last edited by FetchMeAPepsi; February 1st, 2013 at 01:23 AM.
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