Guide plates are normally used with HIGH lift cams. I didn't use them with my 583-607 lift cam And right now I don't have them on this new motor/Cam just shy of 700 lift. And another reason people use the guide plate is with bigger Dia. push rods Because they open up (drill out )the push rod hole. which is pretty much a slot in stock form. When its just drilled out it does not work as a guide very well anymore. When I did my Head I kept it as a slot So I don't feel a Need for the guide plates. But that's me.
hope my 2cents helped.
God doesn't like ugly.
