The Stovebolt Site Forums The Shop Area Engine Shop carb base gasket

i glued my base spacer for now just to get it back running ,, is there a gasket aslo that goes on and if so were ? on top of the base spacer ?

thanks

Top and bottom I think. They come in a carb lit, or you can make your own pretty easy.

A lot of people put them top and bottom.
Originally there was not one on the bottom.
I do not like using one on the bottom because I feel that the squishiness of the gasket can cause the insulator to crack.

I only use one on top also like Pre 68 Dave.

Pete

Well got it all together and al is going well, , i did a gasket below and on top and ideling great i will tune it tomm but i was getting about 18 on my vac gauge is that good, i might be able to get more

Thanks

18" I think is OK at idle, though you'd like it higher - should be higher if the engine is recently rebuilt, I think, but it's still a healthy #. You may get higher if you tweek the timing, and check the idle mixture screw?

Most important thing would be to check carefully for any vacuum leaks around the base. "Common Wisdom" way to do this, is to spray carb. cleaner or some such around the base of the carb - if there's a leak, it will get sucked in, richen the mixture and the engine will speed up noticeably for a few seconds.

Personally, I don't like spraying anything on my engine if I can help it. I use an unlit propane bottle or acetylene torch for the same test. Use just enough flow so the engine speeds up some when you hold it near the air intake. Then, slowly move it around all sides of the base of the carb to see if there are leaks in the gaskets.

While you're at it, you can check for leaks around the intake manifold as well, not-to-mention the vacuum line to the vac. advance, and to the wipers and/or the hydrovac, if applicable.

My thoughts, anyway . . .

-Michael

Well i think i only have 2 vac lines, 1 to the dizzy and 1that comes off the intake, this the one that is hooked to my guage, ,the wipers come off the fuel pump, were does the hose go that comes off the intake, the mod valve on tranny?

Thanks

What is a mod valve on the tranny?

What kind of transmission do you have?

On small/medium trucks, the vacuum hole on the intake would have gone directly to the standard/stock vacuum wiper motor. With a dual-action fuel pump, that vacuum line would have gone into the "in" port on the bottom chamber of a dual-action fuel pump. Or, if the truck has an electric wiper motor, that vacuum-line hole on the intake manifold would have been plugged.

i have a 2 speed PG
modulator valve on trany now goes stright to the intake port,
i do have a duel action fuel pump , on that line you can feel it pumping
thanks