Rochester Quadrajet base gasket choice...

[crazyboat1976]

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

[Drag Racer]

Xavier.
Only use the "open gasket", top one in picture. The bottom pictured gasket is for the throttle plate to carb body joint.

[crazyboat1976]

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

[crazyboat1976]

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

[crazyboat1976]

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.