valve spring pressure

[pmrphil]

Originally Posted by jamie2370

350 sbc, flat tappet hydraulic cam(stocker motor) Thinking I have valve springs going causing car to not turn over 5500rpm. I used an on car spring tester. I got 110ish to just open valve and around 250ish at .500 lift(1/2" measurement), tested with that valve closed and I could spin pushrod with my fingers. Looking at Pac 1409x , it shows like 150/390. I'm thinking the springs are gone??

Some of the on car testers vary a lot in the readings - I've had them off by 45 lbs. when checking. They should be used for reference, and the spring should be checked with a calibrated spring tester to be absolutely sure of what you have.