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Had a similar problem.
When I switched from adjustable rockers to CompCams roller rockers, I had to change pushrods (shorten them) to keep them from hitting the bottom of the rocker arms. George Anderson at Gessford sent me 3 or 4 pushrods until I found the right size. I got them from "Smith Brothers" or something similar to that name - They are in Oregon I believe.
A few thoughts..
If the pushrod cup is too wide or the pushrod is too long, it will put a "smile" indentation under the bottom of the rockers. This can either cause the rod break the rocker arm, bend or jump off the adjuster.
If they are too short, the adjust ball comes out too far and can break off.
Beyond that, faulty lifter? Rod hole alignment in the manifold? Rocker arm seized?
Good luck! Hope it is minor!
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James
A few ERAs, SPFs, Shelbys, Kirkhams...
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