Inliners International Forums General Discussion Hi Performance rockers

i have a 250 chevy it has the BB chev screw in studs - i need the fulcurm (sp??) balls cause they wont sit down in the rockers (i`m using the BB fulcrum balls)

where can i get the proper ones
thanks

The inlines all came with 1.75 ratio rockers with small holes in small fulcrum balls. The big blocks use a 1.70 ratio, larger diameter studs and larger balls. Unfortunately, there are no interchangeable parts from one type to the other. If you put in the big block studs, and want to use a stock rocker, you will have to use the entire assembly from the big block also. And there isn't much room between the rockers anymore when you do that.

Most times on these engines, the builders use roller rockers when going with the larger diameter screw-in studs.

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David
newbie #4153

Are they the 7/16 or the 3/8 studs? if there the smaller stud dia. you maybe able to use the L6 fulcurm ball. But like Just a six said studs are normaly used with roller rockers. }[oooooo]



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NovaMan/Twisted6/Larry

Thanks for the info. These are 7/16 studs. The big block rockers can't be used as they bottom out on the stud nut before you can adjust them. I have opened up the rocker to allow the stud to fit through, now I have to find some way to drill out the fulcrum or pull the studs and start again.

I've seen studs that have a 7/16" thread for the head and 3/8" sticking up for the rocker. Seems to me Comp Cams had them.

If you are running out of thread on the bug block studs before the rocker touches the valve, then you might try PolyLocks instead of the stock nut. They have an unthreaded shoulder so can adjust the fulcrum ball lower on a given stud thread length.

Your odds of opening up the fulcrum holes are pretty slim, as they are very hard metal.

Good luck, and let us know what you end up using.

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David
newbie #4153

It kinda sounds as if the boss has not been cut down far enough? I have seen this problem when going from the smaller stud to the bigger one Sometimes the boss has to be recut?? Hope this helps }[oooooo]



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NovaMan/Twisted6/Larry

Thanks for all the info. I tried everthing to open up the fulcrum balls, but no luck (just a bunch of burned drill bits) I have now pulled the big studs and replaced them with lt1 screw in studs. 7/16 bottom and 3/8 top. Will have to get new stock rockers now as I ground them out to fit the big studs. On the good side, I learned something, I guess that what happens when you like to play. Thanks again

I have a few sets of stock rockers and balls If you want them ? Hope this will help.
}[oooooo]
Just Email me and let me know. Not like i'm going to use them.



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NovaMan/Twisted6/Larry

Thanks for the offer Larry. We had already picked up the parts we needed. Now we are on to playing with the 390 holley trying to lean it out a bit as the plug are getting coated in black.