The thing with hard block is your trying to
stabilize the center area of the bores.. with
a short fill your really not doing anything
and IMO is a waste and just added weight.. so
if you fill high enough to do what its intended
to do then you run into the hot oil issue and IMO
a oil cooler is needed.. even then the oil still
gets fairly warm.. and as in any time the oil gets
heated up it gets thinner(viscosity) and pressure
gets lower... I have had a engine with it on the
streets and it did get the oil hot.. so I dont add
it to any street car engine... JMO.. but since its
already done use a good synthetic oil and a cooler