Manifold Vacuum Experiment

Phreakish said

Anyone got any good sources for low vac canisters that add ~20deg or so?
I bought an accel one because the manual showed a graph with a low all-in vacuum, but when I tested it with a hand pump, the all in is like 16" and I'm looking for 7-10".
The low vac corvette one everyone used to use on bullet distributors are NLA, as far as my searching has yielded. Got skunked on ebay too.

Click to expand...

Now I have the GM HEI big cap style distributor in my Ford 400. This is the advance can I just put on it. It pulls in right AT 20 degrees at idle with the screw turned all the way CW.
https://www.summitracing.com/parts/sum-850314#overview
They also carry Summit brand advance cans for small and big block Chrysler. I would "assume" ( I know, dangerous) that they would also pull in around 20 degrees. I would think with Summit's great customer service, that you could return it if it did not meet your needs.

Small block:
https://www.summitracing.com/parts/sum-850426
Big block:
https://www.summitracing.com/parts/sum-850427