I also had this issue with a solid roller from Comp for a big block. It would not go in the block. First I thought I had buggered up the cam bearings but looked fine after inspection. Then I slid in the old purpleshaft I had previously in the same engine with ease. Also had another brand new Comp solid roller on hand but for a hemi that I tried. It fit perfect. I measured the journals of the faulty cam and found them to be in spec. This lead me to believe the cam was bent. Called Comp and they tried to say it was my block. I asked how in the heck is that possible when the other 2 cams I had on hand fit perfect? Not to mention that one of the cams was also one of their products. After going back and forth, they ended sending me another cam and it fit fine.