vacuum gauge to solve idle issue

Ok so checked metering rods and at idle they are all the way down. These are the original springs from my winter rebuild. So I'm assuming stock?
Bumped up initial to 30* still no ping. Steep hill at 25 mph, then accelerated (moderately) no ping.
At idle in park 30* initial (vac un hooked and plugged) BUT vac dropped to 3"HG.
I do have spare springs and metering rods for an Eddy to tweak, but was trying to get timing figured out first.
Cam specs you mentioned are correct
Thanks for reply!

AJ/FormS said

I'm guessing your valve timing took a jump or your intake valves are not closing.
That cam is too small to make only 5" of vacuum at 775 idle and 25* of lead.
And the vacuum should peak at a higher number Too.I'm guessing your Metering rods are not staying down.

The cam specs are 270/270/110 @+4, and 224/[email protected], and .468 lift and .022 lash. That should idle at nearly double your 5".

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