Gt40p Stock Rocker Shims?

[TRIBUNAL]

So I recently had a set of GT40P's rebuilt. When I disassembled them I thought there were shims, but I'm not 100% positive. I am reusing the rockers and what I have read seems to say to say you don't need to do anything with stock rockers, bolt down and go. I did bolt them down and some rockers have a ton of play, side to side. I thought there was an issue and then I was thinking maybe its because I didn't install shims? Then again wouldn't shims make more play? Anyway I realized I had not filled the new lifters with oil and perhaps that's causing the play? I am going to prime the engine before I crank it. Anyway I was wondering if anyone had suggestions and whats the story, could the stock heads have had shims or should I just bolt them down and finish up?
Thanks guys, couldn't have done it without you.

 

[General karthief]

Post a pic of your installed rockers.
You do have the rocker arm fulcrum/guide installed right?

 

[Black1987]

So I recently had a set of GT40P's rebuilt. When I disassembled them I thought there were shims, but I'm not 100% positive. I am reusing the rockers and what I have read seems to say to say you don't need to do anything with stock rockers, bolt down and go. I did bolt them down and some rockers have a ton of play, side to side. I thought there was an issue and then I was thinking maybe its because I didn't install shims? Then again wouldn't shims make more play? Anyway I realized I had not filled the new lifters with oil and perhaps that's causing the play? I am going to prime the engine before I crank it. Anyway I was wondering if anyone had suggestions and whats the story, could the stock heads have had shims or should I just bolt them down and finish up?
Thanks guys, couldn't have done it without you.

If I recall the local machine guy recommended only shims on the exhaust side. I went looked at the box of springs.

 

[jrichker]

Michael Yount’s valve adjustment procedure

Here's an easy way to determine this. Start with the #1 cylinder. Rotate the engine with a ratchet on the crank bolt clockwise. Watch the #1 pushrods. First the exhaust pushrod will rise and fall signaling what would be the exhaust valve opening and closing if the rocker were on. As it closes the intake pushrod will rise -- keep rotating clockwise until the intake pushrod falls and is level with the exhaust pushrod - both at the same height. Both lifters are now on the base circle of the cam - both valves would be closed if the rockers were on.

Now, install both rockers. Tighten the bolts with one hand while rocking the rocker with the other hand - continue until you reach the point where you can't 'rock' the rocker any more because there's no gap on the valve stem end or the pushrod end. You are at zero lash - i.e. - no gaps. Stop tightening just as you reach this point.

Now, put your torque wrench on the bolt and tighten it to 18-20 ft-lbs while counting the number of turns it takes to reach the torque. You should hit the torque within 1/4 to 1 turn of the bolt. If it takes more than 1 turn, use a shim to raise the rocker -- each .030" shim will reduce the number of turns to torque by about 1/4 turn. If you reach the torque in less than a 1/4 turn, or you have trouble reaching zero lash even at full torque, then you'll either need longer pushrods, or to CAREFULLY remove some material from the bottom of the rocker fulcrum. Using the procedure described above, you will work through the remaining 7 pairs of rockers. If you follow the firing order, it will minimize the manual cranking you have to do to get the lifters on the base circle of the cam prior to installation of the next pair.

When I first went through mine, 13 of them took no shims; 3 of them took 1 .030" shim. Upon cranking it up, one or two of them sounded a bit noisier than I thought was right, so with the engine hot, I pulled the upper off, and the valve covers, and went through the installation procedure again. That time, 11 of them took no shims; 4 of them took one .030", and one of them took one .060" shim. And they were very quiet running.

Good luck with it.
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Michael Yount - K'ville,TN 82 Volvo 242w/5.0L; 2000 Suzuki Bandit 1200