So I got the replacements and can't blow through either one of them. Called Hughes and talked to the other Dave, went through the whole scenario with him. I told him I didn't want to install these lifters because the good lifter flows air freely through it and these do not. He agreed and said he would air check a set on Monday before he sent them out to me. Asked me to send all the others back to him and apologized for the trouble I was having. So no bashing of Hughes here, they were good, I know it's not their fault but this has certainly soured me on Morel. I try to buy made in the USA but when you come across crap like this it really makes you think twice. I'm very disapointed.