How much vacuum should I see at idle?
I have right at 7 inches and at choke it is about 20.

Thanks,

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Superman

1981 D150
"The Khaki Machine"

Depends upon the rpm, in gear verses out of gear, one barrel or two.

I run about 16.5" in gear at 550 rpm on a 85 degree day.
18" out of gear with a Holley 1920.

_________________
Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

With a carter 2bbl on a super six manifold and a stock cam I see 15"~16" at an 650 rpm idle in neutral. I have my dash gauge hooked in to a T fitting in the pcv hose. My second dash gauge is hooked in to a T fitting in to the vacuum advance at the distributor, I see as much as 20" inches at cruise.


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