Hi all,

I want to make sure my VA is working and I'm not sure how to do it. Don't laugh, but I tried sucking on the vacuum hose and it did nothing. I can move it with my finger, but it's hard. I mean, it moves freely, just feels like strong springs.

It's a 460 w/a Holley 750, and the vac comes from the carb.

If I remove the cap and have someone turn the engine over, should I see it advance?

How else can I test it?

Thanks in advance!!!

Kevin K.

 

Use a hand operated vacuum pump,cheap tool available @parts/tool store or run long piece of hose to running vehicle nearby.Brian

 

Hook up a timing light. Run the engine just above idle speed. Pull the vacuum line on and off. You should see the timing jump everytime you put the vacuum line on. Or if you want to hook the vacuum line to manifold vacuum, you could leave the engine idling. Everytime you take it on and off manifold vacuum, the idle should change and the timing will jump with the timing light hooked up.