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!
'79 CJ7, mild 360, t400 auto, 33" boggers
'88 YJ, I6, 5 speed, 34" TSL's
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
best ever 11.669 @ 112.33 mph in 1/4 mile on 33 x 10.50 slicks and 4" lift / 7.358 @ 93.03 mph in the 1/8 mile
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
1969 AMX
1967 Rambler Rogue
If you need a tool and don't buy it...
you'll eventually pay for it...
and not have it.
Henry Ford
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