i'm currently using crane iron on one engine I drive and have used several sets thru the years. the other engine I drive on has the old crane gold roller tips. I can tell you from experience the alum roller tip is overall better. geometry is much easier to set up with a roller tip. you just bought a low end rocker and they are what they are. the irons won't break but the tips and fulcrums go to crap, sometimes too soon. also if your looking at a ratio upgrade be very careful of retainer to guide clearance with those '452's.