Had a cam laying around, so we decided to throw it in my buddy's motor. Installed the cam and new lifters, greased and oiled everything good. Cranked it up, ran fine for a little while, now the rocker bolt on the intake vavle on #2 cylinder keeps backing out and unseating the pushrod, noticed today that I had to push the lifter now hard for it too move, tighten everything back up and reset valve and ran back to the launch with no problems. Anyone ever had a problem with a stuck lifter ? I'm maybe leaning towards a bent valve or rocker throwing that side out of wack.