Carb setup vacuum

CRAIG · Post by **CRAIG** » Tue Aug 02, 16 9:24 am

Morning

I cant seem to increase the vacuum when I adjust the two screws on holley carb.
Car is warm, and in drive with dizzy disconnected. My vacuum gauge doesn't move hardly at all.

Ideas

Pete · Post by **Pete** » Tue Aug 02, 16 9:26 am

I assume you are talking full manifold vacuum not sparc port?

CRAIG · Post by **CRAIG** » Tue Aug 02, 16 9:35 am

Yes bottom port. No vac at all at top one.

MilesnMiles · Post by **MilesnMiles** » Tue Aug 02, 16 10:04 am

Have you tried bumping the timing a bit to raise vac?

CRAIG · Post by **CRAIG** » Tue Aug 02, 16 7:44 pm

Timing seems ok, so I don't wanna mess with it. Would increasing the idle speed help?

Is it worth blocking the pipe from carb to pc valve on rocker cover and block the vacuum pipe to brake booster?

Pete · Post by **Pete** » Tue Aug 02, 16 7:50 pm

Maybe with the cam that is installed that is all it makes.

Many of my cars have only made 5" Hg at idle....

CRAIG · Post by **CRAIG** » Tue Aug 02, 16 8:06 pm

Ok, I will check again tomorrow and see what vacuum im getting.