Out of eight new power valves (PV), Two open within a 1/2 inch of rated vacuum; others opened at two to three inches below what is rated. Most recently, I purchased two holley PV, 95 & 75---75 opened at 70 & the 95 opened at 60. I used a Moroso PV tester and a dial indicator. PV names are Quick Fuel, Holley and unknown. I did the tests several times with the same results.

Curiosity got the best of me and I kept buying PV. I am looking for comments; am I doing something wrong?

These PV have not been installed in a carburetor, as yet.

Thank you, Pat.