I asked my question poorly about timing the LT1 circa 1970.
I had expected the Holley 4555's vacuum tube (front of base) to be ported, hence my orginal query. Now I suspect it's not ported vacuum, and the pic would seem to confirm? Would appreciate a second opinion on this.
The red arrow indicates where my distributor is connected to the common hose, and the rectangle indicates the tube-in-carbie.
So: all my manuals being silent on the issue, am I right in thinking that timing is set with the vacuum line connected to the distributor? That would be new to me, being accustomed to Autolites and Webers with ported vacuum for the distributor, where the vac hose is disconnected and plugged for setting static timing.
In addition to a confirm or deny, wouldn't mind knowing the reasoning behind having both static and vacuum advance at idle (if that's the case)?
Cheers from Down Under.
(changed large image to link -aapple)
|UPDATED|11/7/2011 9:02:57 PM (AZT)|/UPDATED|
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1968E (2nd month production) convertible first registered California 1967 and a retired SCCA race car. It is still race prepped and built up as a '69 ZR1 (announced '69 but not built until '70); i.e., the L88 car with LT1 motor.