If I keep having to buy parts like this, you might be right. I was getting ready to buy standard Harland Sharp rockers for $619 and noticed that there was a special listing for use with Edelbrock Performer RPM Heads after some research and a call to the Manufacture it seems that the Eddy heads valve position needed a .060" offset toward the exhaust side of the head to correctly align everything and the just happen to only come in there Heavy duty version....long story short, New Rocker, New Price
........ $ 849 Arrived today