When you put a roller cam in a non-roller block, does it just go in like a regular flat tappet cam, or are there other things required such as cam button spacers and what not. They sell these spacers that prevent camshaft "walking" and they sell special cams for non-roller blocks. Are these needed? Whats the difference between a regular roller cam and a special cam for non-roller blocks??? Can you just throw in a regualar roller camshaft or do I need a special cam?? I know everything else needed, like special valve springs, roller lifters, and stronger pushrods, special distributer gears, head machining, cam clearing rods, and optional rev kits. Also, I have a set of brodix heads set up for a roller camshaft and I was wondering if anyone knew if they needed special length push rods or if I can use stock length. Any info will help, thanx again.