Hi Frank, the issues Gordon is experiencing is the exact reason we tell almost 100% of our own customers to AVOID using the Chevy valves.
Under most circumstances they are NOT necessary. I'll put this here again, if you have "small-base" cam vs lifter issue simply use lash caps, they will add between .060" and .080" to the end valve lengths and have NO effect on the springs or spring pressures!
Life is simple when you tend to keep things in perspective??
(Add) You need to ask yourself "at what point does the budget interfere with the amount of time/labor spent on the solution"??
Thanks, Gary in N.Y.
P.S. On a side note, I do believe Gordon has "licked" his problem AND will end up with the keepers in the correct grooves with his Chevy valves?, just a "hunch"!