Now about the 289 hipo.This IS a different balancer altogether.Why? The
true 289 hipo had a thin add-on counter balance added to the front of the
crank,behind the timing chain,the harmonic balancer is thicker and has a
different part no(C5OZ-6316-C) BECAUSE IT REALLY IS DIFFERENT.
So no you really SHOULD NOT use the hipo balancer unless you use the counter
You cannot use a double roller chain if you use the hypo counterweight. My
machinist plugged my hypo damper with extra weight (to make up for it), and I
use both the hypo damper and a double roller chain.
Jim Leach, Seattle