Jeff,
On idling, well maybe, but then again maybe not. The picture of the Endure-X is one of the tricks that can help avoid this. There are also other solid roller lifters which supply
oil to the roller bearings and, by default, to the cam, like Crower 66215H, Isky Red-Zone 3972-RH. These two
oil even better than the Endure-X; more like the Gen III pictured above, BUT Comp doesn't make Gen IIIs for SBF. With a little care taken to manage the
oil distribution in the gallies (exactly how is dependant on the block you use) and a good blue printed oil pump. You can avoid these issues. My solid roller cam only requires spring pressures of 150lb on the seat and 420 open and provides very good power through 7000 rpm. (see thread "Max Engine RPM" in the engine/drivetrain forum on GT40s.com for a more indepth discussion. There is also a good discussion here:
Solid Rollers
Lynn