bones

I have temporarily installed an '81 distributor with a vacuum advance /retard mechanism in my '78 911SC as the retaining flange on my purely mechanical one broke during my recent engine refurb'. The car seems a little slow to build revs above 4,000 rpm when normally it takes off, does anyone think the distributor could be the issue?

bones

Subsequent to the post above I have been told an '81SC distributor has significantly different electronics and mechanical parts to an '78SC distributor can anyone confirm this?

Steve Weiner-Rennsport Systems

They have identical electronics,...only the vacuum cannister(s) and advance specs are different.

bones

Thanks Steve