1970 YS 400 stock rocker arm tightening steps? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-02-2012, 05:57 PM
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1970 YS 400 stock rocker arm tightening steps?

Hello, I started getting some ticking from the passenger side of motor, (noticed it after driving and just before shut off), and sounds like it is coming from inside the valve covers so thinking of checking the rocker arm nuts to ensure they are as tight as they should be. If I find original style pontiac rocker arm nuts what is the proper procedure for checking the torque and then tightening them if they require it? Does the rocker arm have to be in a certain position prior to checking and/or tightening or is it as simple as running down the rocker nuts one by one to check and/or tighten as need be? I have the specs for stock nut torque which without looking I believe is 19ft-lbs.

1970 Pontiact Firebird 400 YS block original heads.

Happy to provide more info if needed.

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Old 05-02-2012, 08:02 PM
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The press in studs can pull out causing excess valve lash.
Pull the cover and look to see if the top of one of the studs is higher than the others. Or Start the car and listen with the cover off, to zero in on the offender, and then rotate the engine and check the rocker for excess lash.
Then check the stud height to see if it is pulling out.
If the studs are OK then maybe the rocker is worn or pushrod is bent a little and is making noise.
Bottleneck studs are tighten to 20 ft Lbs on the nut.
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