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Re: Valve Adjustment screws too short
rkworman #1378292 Thu Sep 24 2020 02:45 AM
Joined: Feb 2004
Posts: 21,050
Were the valve guides replaced? Either the guides have been installed at the wrong angle, or somebody has made some huge mistakes assembling the rockers on the shafts. Thee are four different rocker arms on a stovebolt engine, with different angles, and possibly different lengths for intake and exhaust. I'm going to guess somebody has made some fundamental errors when putting the rockers on the shafts.

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Re: Valve Adjustment screws too short
rkworman #1378333 Thu Sep 24 2020 03:34 PM
Joined: Dec 2017
Posts: 810
Shop Shark
Where did the rocker set come from?

Re: Valve Adjustment screws too short
rkworman #1378463 Fri Sep 25 2020 10:38 PM
Joined: Jul 2020
Posts: 6
New Guy
Thank you for all the help.
I think I found the problem with my rocker arms. I have some intake rocker arms from an older 235 and some are from the newer 261. The exhaust are all correct. The intakes rocker arms that are correct have a 7 and an 8. The rocker arms that are not correct have a 4 and a 5 on them indicating they are from an older 235 engine. I'm going to see if I can find the correct rocker arms for this engine.

The engine I have is a 1958-61 261. I think when they rebuilt this engine they mixed and matched rocker arms from the original 1948 235. I know the engine was rebuilt because the cylinders were bored 40 over. This engine was rebuilt before I got the truck and I do not think it ran much because the bearings all looks new when I took them out. also other than two of the pistons where seized in the cylinder they were fine and still showed the crosshatch from the honing.

One other interesting note is the rings that where in the engine where not 40 over and the ring gap was really large.

The truck I'm restoring is a 1948 two ton stake bed.

Thanks again for your help!

Re: Valve Adjustment screws too short
rkworman #1378532 Sat Sep 26 2020 02:02 PM
Joined: Feb 2019
Posts: 844
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You’ve got to be careful because Chevy made a design change in the rockers for ‘59. They opened up the restrictor and pressurized the rocker arm by offsetting the oil groove in the bore of the rocker arm. Thanks to chev235guy, you can read about it here. Rocker Evolution []

Last edited by Phak1; Sat Sep 26 2020 02:03 PM.


1952 Chevrolet 3100
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Re: Valve Adjustment screws too short
rkworman #1378958 Wed Sep 30 2020 04:23 AM
Joined: Jul 2020
Posts: 6
New Guy
I went to a classic car wrecking yard here in Wendell and found a rocker arm assembly off a 1959 Chevy 261 and it is the correct rocker arms. I replaced the ones on my rocker arms that were not the correct numbers and now the valve alignment is better. Not perfect but better than what is was by a lot. The adjustment screws for the valve lash are correct now.

I'm going to finish assembling the engine and check the oil flow before I install it back in the truck.

Thanks to everyone for all your help.


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