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I was breaking valve springs in my 427 center oiler 10 years ago and talked to George Anderson at Gessford Machine. He had me send in the spring(s), retainer and the "spring cup". He looked it over and sent me a set of Comp springs and cups. They worked flawless until Keith Craft replaced everything when he rebuilt the engine a few years ago. Brent might help you out or call Gessford Machine. Being hydraulic rather than solid lifters should make the selection a lot easier.

Tim