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Adjustable Rocker Assembly Screw Sizes

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Matthew68
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Adjustable Rocker Assembly Screw Sizes

Post #1 by Matthew68 » Tue Sep 18, 2018 10:18 am

Hi Folks,

I have two sets of adjustable rocker arm assemblies. I'm in the process of rebuiling and restoring both assemblies, including drilling out the valve side oiling holes. One thing I noticed between the two assemblies is the adjustment screw is a little different on both sets. One one set, the adjuster screw has a 7/16" head size, while the other assembly has a 1/2" head size for the adjusters.

As far as I can tell, the screw is otherwise exactly the same. I haven't taken apart the 1/2" assemlbly yet, but the ball that sits in the pushrods appear to be the same size for each.

Did Ford offer two different sizes or change sizes after a certain year? I don't see part numbers on the adjuster screws, so hard to tell.

Thoughts?

Cheers,
Matthew
1968 Mustang Coupe 200ci - Pertronix + Coil
Gulfstream Aqua - Interior + Exterior

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bubba22349
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Re: Adjustable Rocker Assembly Screw Sizes

Post #2 by bubba22349 » Tue Sep 18, 2018 4:20 pm

Yes The rocker arms internal thread sizes should all be the same and therefor interchange. The rocker arm adjuster nut size can be different though depending on the original part supplier so trying to match all 12 of them to one size is a good plan to follow. :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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Re: Adjustable Rocker Assembly Screw Sizes

Post #3 by CZLN6 » Tue Sep 18, 2018 5:39 pm

Howdy Back Matt:

That's a new one on me. Do you happen to know the year and vehicle application that each came from? Thanks, in advance.

Adios, David
co-author of the Falcon Performance Handbook
http://www.falcon6handbook.com/

Matthew68
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Re: Adjustable Rocker Assembly Screw Sizes

Post #4 by Matthew68 » Tue Sep 18, 2018 7:23 pm

CZLN6 wrote:Howdy Back Matt:

That's a new one on me. Do you happen to know the year and vehicle application that each came from? Thanks, in advance.

Adios, David


Hi David,

I do not, unfortunately. I’ll post a picture shortly. The entire shafts are uniform on each, as in one shaft has all 7/16” and one shaft 1/2”. I could try and get the part number off the actual rocker, but I’m not aware of any other part numbers on these assemblies (please educate if I’m mistaken). I bought the two assemblies from someone who had come by them second hand, so no history to share.

Cheers,
Matthew
1968 Mustang Coupe 200ci - Pertronix + Coil
Gulfstream Aqua - Interior + Exterior

Matthew68
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Re: Adjustable Rocker Assembly Screw Sizes

Post #5 by Matthew68 » Tue Sep 18, 2018 7:29 pm

Images of the nut and ball attached via link. Still having issues uploading to the forum directly, sorry.

https://ibb.co/iBBf1e
https://ibb.co/h784SK

Hard to tell in the second picture, the the ball end is the same on both (to the naked eye, I’ll get out my caliper later to confirm).

Cheers,
Matthew
1968 Mustang Coupe 200ci - Pertronix + Coil
Gulfstream Aqua - Interior + Exterior

mustang6
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Re: Adjustable Rocker Assembly Screw Sizes

Post #6 by mustang6 » Fri Sep 21, 2018 1:38 pm

I have seen both sizes as well, never tried to interchange the screws themselves though. I agree with the idea of just keeping a matched set on a given rocker arm.
Scott

68 Mustang 200 ci, Aussie 250-2V head, Dual Headers, Comp Cams 252H, DSII w/MSD 6AL, T-5, V8 suspension.

65 Ranchero 200 ci, late 170 head, Autolite 1101, 3.03 3 speed, Maverick 8" 4 lug rear with 3.55 gears.

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