Can I modify a stock rocker slot for a temp fix? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-06-2009, 12:47 PM
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Can I modify a stock rocker slot for a temp fix?

Heres the scoop...

Can I modify stock rocker to have a longer slot for the stud?

I have a .480 lift cam and need to drive my car for a few hundred miles. I broke a roller tipped rocker arm and replaced it with a SA rocker arm that a friend gave me. The roller wasn't siting on the valve stem and the rails of the rocker were mashing up the keeper. Also the pushrod was rubbing on the slot in the head. I bought a stock rocker for a 1972 chevelle 350 from the parts store today and noticed it has a little slot for the stud. Should I run it like it is or do I have to enlarge the slot for my higher lift cam with a drummel?

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Last edited by elano; 03-06-2009 at 12:57 PM.
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Old 03-06-2009, 01:03 PM
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Yes you can. "Back in the day" it was quite common. Like anything don't go crazy, take off only what you need, remove any burrs, and don't over-heat the thing while you're removing the material.
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Old 03-06-2009, 01:05 PM
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Old 03-06-2009, 04:09 PM
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Thanks Engineczar!

I grinded it out and put it on. It seems to work good.


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Old 03-07-2009, 08:55 AM
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I was adviced that this was a VERY poor idea. I'll be putting on another one. It only has to last 2 days.
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Old 03-07-2009, 10:07 AM
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There`s no telling how many times in the past we used stock rockers with high lift cams. we were using a .500 lift cam and it never made contact, we didn`t modify it either. But what we would do is get the valve in adjustment then cycle the engine over by hand to check for contact.
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Old 03-07-2009, 03:44 PM
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I wouldn't consider it a very bad idea. If you were telling us you were going to race it and turn 7000 rpms I wouldn't advise it. To get you around for a couple of days with the cam you have providing you just baby it then it's not.

You'd be surprised as to what you can get away with on an engine. What you basically made was a long slot rocker by lengthening the slot which is something hotrodders did for years before you could just pickup a catalog and buy them.
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Old 03-07-2009, 06:20 PM
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that valve spring keeper looks spooky. and is that push rod bent? it should not rub anywhere. I would pull the head to be sure no other damage is present. bent valve, ect.
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Old 03-07-2009, 06:37 PM
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modify stock rocker

use a round file to keep the heat down also you don't need to remove that much , clean up any flashing after you file it. It will work in a pinch but don't Romp on it .
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Old 03-08-2009, 03:08 AM
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rocker arms.

Personally, I would be a lot more concerned about the metalic shavings and particles that came off all the worn parts. Long slot rockers have been around for many years, and before that, as already mentioned, rodders made their own. Whoever told you it was'nt a good idea is off the mark, especially for a temporary fix. Pull
your oil filter off, and cut it open, whatever you find in it is only a small amount of the loose metal that is still in the motor.
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