  A recent paper [Go $\textit{et al}$., Phys. Rev. Lett. $\textbf{121}$, 086602
(2018)] proposed that the intrinsic orbital Hall effect (OHE) can emerge from
momentum-space orbital texture in centrosymmetric materials. In searching for
real materials with strong OHE, we investigate the intrinsic OHE in metals with
small spin-orbit coupling (SOC) in face-centered cubic and body-centered cubic
structures (Li, Al, V, Cr, Mn, Ni, and Cu). We find that orbital Hall
conductivities (OHCs) in these materials are gigantic $\sim 10^3-10^4\
(\hbar/e)(\Omega\cdot\mathrm{cm})^{-1}$, which are comparable or larger than
spin Hall conductivity (SHC) of Pt. Although SHCs in these materials are
smaller than OHCs due to small SOC, we found that SHCs are still sizable and
the spin Hall angles may be of the order of 0.1. We discuss implications on
recent spin-charge interconversion experiments on materials having small SOC.
