Any input on what shaft mounted rockers to use?

[Caprimaniac]

Finally I settled with Jesel's.

Although, after timing the cam correctly and checking piston to valve clearance, I figured I could have ran 1.7 ratio exhaust- I was then tempted to go with Crower (which are even more expensive...) . But then a person talked me into sticking to the 1.6 ratio. Maybe a mistake. (Because the cam is symmetrical; lift & duration same on in and ex. And I stick to the theory that this engine will do better with a little more on the exhaust side....) And I also figured ot that the SS Crower parts were not more expensive than their aluminum stuff... Well; I will have to get an assymetric cam next time.

Thanks for input

[Caprimaniac]

As one can clearly see, the rocker stud has been eaten by the rockers.... This isn't the worst example. How long will it take to break one of these studs by the ROCKING action by the rockers? I'd guess there were 0,5mm missing from the stud, in a ring- shaped pattern around the circumference.

Also, the rocker have clearly touched the valve retainer. Although when thesting on the work bench, the clearence is 2-3 mm.




Hope the pics are shown this time.

RS

[RICK LAKE]

caprimanic Before you get crazy on this, I have seen this before with windsor motors.
6 things cause this, There is too much clearance between the stud and the rocker. sloppy in the hole. There was no stud gridle to control the rockers and stablize the studs. How many times was the motor banged off the rev limiter? Poor oiling between the trunion and the stud.The wrong pushrod length. You also have the rockers hitting the springs, see the 2 marks on the under side. I think going back through the geometery of your valve train is needed. It looks like not enough clearance. Like to see the other rockers on the under side too. What was the coil bind on this?
From the pictures, I am going with over revving and banging a limiter. Valves banging rockers and cause deflection.
You might also want to recheck the valves, some of the stems have a wierd wear pattern on the shafts. Looks like the chrome is being worn off. Rick L.

[blykins]

Check your valve guides for wear while you're looking things over.

Under very high rpm loads, parts will move all over the place. Rocker studs will deflect, rocker arms will deflect, valve guides will start to wear in one spot, etc. The combination of all of these will cause the problems that you're seeing. Everything is dancing around and moving and the areas where you had clearance before may not have clearance anymore.

I'd say your problem will be solved with your shaft mounted rocker arm setup.

I'd pop the valve seals off and do a quick "wiggle" test on the valve guides...