[LeeH]

It was the early design Systemax heads which had a slightly rotated valve arrangement similar to the TFS TW heads, Holley didnt put the design effort forth to correct the problem like TFS did. It was a geometry problem alright but you cant cure it with changing push rod length, It was a design problem. Some of those heads wouldnt go 500 miles without eating the guides up. Brian Tooley(TEA) worked for Holley when they designed them and was in on the Systemax project, I cant remeber who made the old heads but the new ones are made by Canfield for Holley. Soo if you want any specifics on the problem call and ask Brian.