I purchased aluminum heads and the gold aluminum roller rockers for my big block olds I spent a lot of money with the company my roller rockers were missing an adjusting screw all I ask is that they sell me one they told me I have to buy a whole nother kit 200 bucks for an adjusting screw I thought they were respectable company but they lost my business User's recommendation: Stay away from Speedmaster products here's a picture of the boat they want me to spend $200 for.