Probably a combination of too much valve spring pressure/pushrod angle and a crappy piece of sh*t cam.... I did have 1.6 rollers that I was swapping out when I found the dead lifter. I'm going to go with a .480-ish lift & less than 290 duration this time around. I'm also looking carefully at the pushrods again. I'm going with 1.5's rollers and I might shim the rocker shaft's too.
Me thinks the .509" + 1.6 rockers were a major contributor to my failure. Basically, I F`ked up...... :oops: