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Old 10-12-2008, 02:55 PM   #1 (permalink)
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rocker arm nut not tight enuf

I put rocker arms on my 74 montego 351w when we try to adjust the lash the original nuts won't go down far enuf on the 5/16 stud to tighten down the roller rocker, would a positive lock like a Mr Gasket 922G work or is there a washer or spacer that I could use to make it tighter or is there a stepped stud that is 5/16 to go into the head and maybe 3/8 for the rocker
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Old 10-12-2008, 03:02 PM   #2 (permalink)
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Re: rocker arm nut not tight enuf

Maybe you got the wrong pushrods...
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Old 10-12-2008, 03:12 PM   #3 (permalink)
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Re: rocker arm nut not tight enuf

I think we need more information on the build. Example:
  1. Did you recently rebuild the engine?
  2. Did you install hi-performance components? Cam , cam kit etc?
  3. Did you piece this all together from parts?
If this is happening on all the rockers then theres probably something wrong with the pushrods length. Only on or 2 rockers, then the stud is probably pulling out.
There could be a multitude of issues that could be fixed with a band aid (washers) or maybe you need to have some machining done,( 3/8 screw in studs.)
More information please for a better more solid answer.
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Old 10-12-2008, 03:21 PM   #4 (permalink)
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Re: rocker arm nut not tight enuf

original heads and pushrods, one step up on the cam, pro comp roller rockers, fresh rebuild on engine
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Old 10-12-2008, 07:03 PM   #5 (permalink)
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Re: rocker arm nut not tight enuf

Those engines have what Ford called a positive stop rocker stud and the nut stops like you said. With your different rockers that changed. Comp cams and ? make a piece to get the adjustment. I think it looks almost like a washer to give more adjustment. That is the easiest and cheapest solution. Do some looking on comps web site and you will find them.
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Old 10-12-2008, 07:07 PM   #6 (permalink)
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Re: rocker arm nut not tight enuf

Ok now i see the problem. Unfortunatly to do it right your in for some dissapointment.
When you start upgrading the valvetrain you need to do more than just one piece at a time.

First im wondering how your locating the rockers?
You need some sort of locating device to keep the roller tip centered on the valve tip. Usually guide plates. Then you need hardend pushrods to go with them.

Another thing thats bothering me about this is you said that the "5/16 nuts" To my knowledge not even Pro Comp makes a 5/16 stud Rocker. If your actually using a 3/8 rocker on a 5/16 stud you are in for big problems.

To the nuts.
You cant run the stock nuts on Roller rockers. From the picture on pro comps website they appear to give you the poly locks with them. Use them.
The stock studs can tend to pull out over time and with non-stock use. Higher valvespring pressures, higher Rpms and just the additonall stress from peformance use can take the toll on press in studs.

Here is a mild performance setup for fairly cheap from Crane Cams.
Crane Cams 36655-16 - Crane Rocker Arm Guideplate Conversion Kits - summitracing.com

The only thing i cant figure out is how the studs install in the heads. Mabey they just form a thread as you install them. (Much like a roll form tap.) Dont know. If so then you have to be VERY carefull on getting them straight.
GL. Let us know.

I remember where i left my brain, this will only work with the pedestal style heads. Duhh.
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Last edited by 71hotrodpinto; 10-16-2008 at 06:58 PM. Reason: more info
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Old 10-12-2008, 08:02 PM   #7 (permalink)
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Re: rocker arm nut not tight enuf

If you have a "rail" roller rocker you should be OK with the Comp kit. If you don't have the rail rocker it is a new ball game. The "stop" was achieved when the 5/16 hardware hit the 3/8 stop.
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