Thread: Fixing a strange engine noise and then some

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guide plates help keep rocker tip on track with valve stem tip with out the rockers can track off the side of valve stem and rocker can start pushing on the valve spring retainers . many of the iron heads have guide slots in them if not a rail rocker tip tracks valve stem center or guide plate . if your using alum heads then you need guide plates and a harden push rods if not they will flay the push rods if not harden. not from flex but side to side movement eatting away the soft push rod . if using a shaft rocker set up then there is no need for any guide plates . a harden push rod will help on flex some but more needed when using a push rod guide plate . i will add a word of caution that there some cheap guide plates (over seas ) out there that are not hard and in time the hard push rods will fill file threw them and if let go,then you will see bad things. many companys jump on the cheap plates and put there name on them and sold them under there name there is alot of bad valve train parts out there