Anyone using the 440 Source Hydraulic Roller Lifters?

I am using the 440 Source Hydraulic Roller Lifters bought last November...I had some problems with them when testing for pushrod length....I heard a click as I rotated the engine and then I could push the plunger in very easy with the pushrod...I contacted them via phone and they said all would be fine when the engine is primed..I wrote them an e-mail last week that they did not respond to.....wonder why?...I started the motor today and shut it down right away....sounded like collapashed lifters on both sides....engine oil pressure was good...when I rotate it with starter trigger no noise...no vibration felt on top of valve covers when rotating the engine....what do you think before I tear the top of the motor off? :clock: