hohner0006
I want to convert my dogleg heads from the bridge style rocker assembly to the stud mounted style Chevy 1.6 / 1.7 rocker arms for the adjustability. Just how much material needs to come off the pedestals to get the correct base height? How deep do I need to have the pedestals drilled and tapped? I need the info so I can tell the machine shop exactly what needs to be done. Thanks!
fuzz401
you will need guide plates too -- due to the big holes the push rods go through compared to the old heads with slots in them
tufcj
They generally mill .250" off the pedestal, that gives you room for the guide plate and adjustability. I'd also increase the size of the bolt hole to 7/16", that allows you to run most standard rocker studs in either 3/8" or 7/16". I used ARP studs # 134-7104 (SB Chevy) with crane gold rockers on my 390 AMX. Harland-Sharp makes a set of roller rockers that will bolt on the late heads with no machining or guide plates, but they are around $450-500. You'd have to compare that to parts and machining on your heads.
Bob
tufcj
