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Old 12-02-2019, 03:59 PM   #1
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Rochester Quadrajet base gasket choice...

Hi guys,

There's a long time ago I did not post something here. I hope you are all fine ;-)

I have a question regarding my Mercruiser 5.7L of 1986. I rebuild the complete carb and finaly I have two possibilities for the base gasket.

Here you have a picture of the plenum when I removed the carburetor from it. Only this gasket was present.

What is your experience with each configurtion of gasket on this engine and wich one do I have to place on mine?

many thanks, xavier
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Old 13-02-2019, 05:28 PM   #2
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Country: Blighty
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Xavier.
Only use the "open gasket", top one in picture. The bottom pictured gasket is for the throttle plate to carb body joint.
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Old 14-02-2019, 04:35 PM   #3
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Hello Drag Racer,

Thanks for your reply. My carburetor is completely assembled (check the joined picture) and I have those two gaskets in hand.
So, if I understand in a right way, the kit is delivered with two base gaskets and I have to use the open one, and the other one is used if we add a spacer between the plenum and the carburetor.

Am I right?

thanks, xavier
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Old 14-02-2019, 05:01 PM   #4
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here's exploded view of the Rochester...this gasket seems to be bottom one and is not open. I'm lost but if you say this is the open one, I'll use it ;-)

thanks, xa
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Old 16-02-2019, 03:13 PM   #5
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Hi guys. Some details about the carb. We can see two gaskets, the thidr is under the flame screen, the base one is not shown. My question.is: is it normal that I have two base gaskets when my carb is fully assembled?

Thanks a lot, xa.
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