[grahambehan]

Once again, interesting.
The LT5 has relatively low contact pressure at the cam/tappet interface <120,000 psi with stock parts. Spring loads are around 100 to 115 on the seat with 235 to 250 open, with stock lift. Whereas the flat tappet engines that require extra additives are typically between 200,000psi to 300,000 psi.
7000 Rpm is not really high rpm, mean piston speeds less than 22m/sec, once again with stock parts.
Oh and I might have seen a cam or two over the last 33 yrs.

Graham