Just for accuracy, the 81 has neither vacuum advance nor centrifugal advance, and with no moving parts other than the rotor shaft, there is very little opportunity for wear or deterioration with age or usage. Of course it has no points or condenser either. All of these functions are performed by the computer - the distributor merely senses the rotation of the rotor shaft and distributes the secondary voltage to the spark plugs. Dick Benjamin ----- Original Message ----- From: Mountainbrook House <mountainbrook@xxxxxxxx> To: <mailing-list@xxxxxxxxxxxxxxxx> Sent: Monday, January 21, 2002 6:40 PM Subject: Re: IML: Installing Electronic Ignition > I used a Mopar Ignition on My 81 Imperials. Pulling out the distributor > takes a second. It is easier to do that than fiddle around inside the old > one. You can count on a 30 year old distributor to have a weak vacuum > advance or wobbly bushings. > Stuart Somers > Two Imperials