Y Block Rocker Arm threads
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Tuned
Joined: Oct 2012
Posts: 371
Likes: 6
From: Slocum, TX
Y Block Rocker Arm threads
I'm a little confused on the thread size for 292 rocker arms. I took out the adjusting screws to clean. Several are really tight. Others feel normal. I'm wondering if i should try to chase the threads? What size tap? Then I read something about "interference threads" in the rocker arms. The 7/16X20 tap will wipe those out and the adjusting screws will be loose. I think the screws that are really tight will hinder adjustment. The threads on the screws are nice.
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
I wouldn't chase the threads. They need to be tight, and stay put. There is a minimum torque spec for the screws in the book below which they should be replaced. I bought NOS rocker arms w/screws when rebuilding the heads in my Y block, and I can testify it is important to have ate yer Wheaties that morning before adjusting the valve lash. Use a breaker bar or extension for leverage.
Post Fiend
Joined: Feb 2008
Posts: 5,831
Likes: 121
From: St Albert, Alberta
I'm a little confused on the thread size for 292 rocker arms. I took out the adjusting screws to clean. Several are really tight. Others feel normal. I'm wondering if i should try to chase the threads? What size tap? Then I read something about "interference threads" in the rocker arms. The 7/16X20 tap will wipe those out and the adjusting screws will be loose. I think the screws that are really tight will hinder adjustment. The threads on the screws are nice.
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