We had a 355 freshly built, dynoed at 348 horse, anyways we recently had a tic comin fromthe driver side head, not long after we broke the rocker.

They were just stock stamped 350 rockers, so we replaced them all with crane roller rockers, and now they are worse then ever.

Took em to a local speed shop and they cant figure it out, they think maybe a bad lifter.

Anyone have any opinions, also can u give us the proper sequence to adjust the valves, I'm gonna do em myself so they are done properly.

Thanks.

 

I tried to adjust the rockers with the car off and just couldnt do it. So I decided to pull the valve covers off and start the car. Loosen the poly lock (allen bit inside the threaded nut) on all the rockers. Be sure to thread them somewhat otherwise your rockers will move. After the car is started, tighten all the nuts with your hand, Once they stop spinning with just your hand that is usually Zero lash because the ticking should stop. Then give them a 1/2 turn with a ratchet for preload and tighten those allen bits down as hard as you can. I've had to adjust mine 3 times because those allen bits keep coming loose. Give that a shot before you tear into the intake a replace the lifters.

 

I put the pro comp magnum 1.6's on my new 383. They are pretty noisy. I measured my rocker geometry at least 5 times now. I have taken out all the pushrods to make sure they are not rubbing unusually on the guide plates, no dice. I even clearanced my aluminum valve covers, since it seemed to be noisier when they were on. I even backed off each rocker while it was running to see if I maybe had a lazy lifter, but they all seemed to snug down and actuate the valve. I cannot think of a bullet proof way to rule out a lifter, but the motor runs strong for having a lousy lifter. For right now I am going to believe roller rockers are a little noisy.