Basically, the distributor has a function known as vacuum advance. It's used to advance the timing of the engine between low to mid range load increasing low speed drive ability.
It uses ported vacuum sourced from just above the throttle butterfly. The effect of the vac advance diminishes as engine speed increases as the low pressure zone in the carb moves from the throttle plate to the main venturi.
This is where the mechanical advance of the distributor takes over.
Been researching vacuum advance, manifold and ported vacuum, timing, intake and exhaust intertia and momentum. A few changes in timing, jetting, and vacuum have been made.
Compresion test today. 190 psi on all cylinders...
If the extractors are the 4-1 type then yes they will fit.
The tunnel may need to be cut back a bit where the selector comes through depending if the gearbox i from a ke55 or a ke70.
Since installing the thermo fan, i've noticed engine running temps are down, while engine bay temps are up due to the fan operating full time. So to give my little weber some relief I developed this...
Its a restrictor pipe from an Holden Astra's air box strategically placed where one of the horns used to reside. It looks a little like some type of sex toy...
Just had a brain fart. The ACL Team was at Jamboree last year handing out gift bags.
They have a new Race Series line out for more modern engines, otherwise their products are branded 'MonoTorque' for the Australian market. Still, I'm not sure if there doing pistons other than the race series.