Originally Posted by
Davehoos
no such thing as correct timing for holden 6-it all depends on the rest of the setup and fuel mixture.
most holdens don't use manifold vac for dist advance.
they use a port above the throttle or venturi vacume to increase timing at high speed cruise. Sorry. That is what I meant.
for pollution engines they swap to a 102 degree water temp port to increase timing at idle--to help cooling system.
most of these engines don't need vac advance-you adjust the mechanical advance that is retarded-as it uses vac at higher revs. ahhh interesting... what I really need to know is how to do that :(
my cars I found the HQ 173 dist advance curve to be good and used manifold vac with airconditioning.