There are four 3/8" plugs that go into the oil gallaries that feed the lifters.
 There are two at the front behind the cam gear.  A third is visible at the
back of the block next to the cam 1 1/2" welch plug on the passenger side.  The
fourth one is INSIDE the block about four inches in next to the cam welch plug
on the driver side.  There is a 1 1/4" hole for a welch plug that you have to
go inside about four inches to install this one. No, you do not need to loctite
them in, nor do you have to put a lot of torque on them to tighten.  They
should be very snug but if you put them in real tight, they can be a bear to
get out in the future.

Ted Harbit Oct2001