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Should last a lot longer than that. Unless you have a '68 service block, it is not drilled for hydraulic lifters. A solid lifter cam is the way to go. As far as the cam wearing out that fast, I would check your lifter bores for size and angularity. You can have them bushed by a good builder, mine cost $500.
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Jeff
“If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough horsepower.”
Mark Donahue
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