I am pretty sure it was some solenoid device on the valve train, along with carb controls. It was not fuel injected. I searched the 'net, and there is VERY little info on this, except for this blurb from Edmunds:
Excerpted from http://www.edmunds.com/reviews/generations/articles/70530/article.html Infamy came in 1981 with the introduction of the V-8-6-4 variable displacement V8. Based on the 6.0-liter Cadillac V8, the V-8-6-4 theory was that individual cylinders would be electronically shut down as engine loads varied; a V8 for acceleration, a V6 for moderate loads and a V4 during cruise. It would have been nice - if it had worked. Instead, it was a mechanical nightmare only slightly less embarrassing than the ongoing diesel debacle. The V-8-6-4 also came hooked to the Eldo's first four-speed automatic transmission. Beyond that, Buick's 125 horsepower 4.1-liter V6 was also offered as an option - the first time any Eldorado had ever been offered with less than eight cylinders' worth of power (the Seville had the ignominy of ending Cadillac's 66-year streak of eight-or-more cylinders of power in 1980). Frankly, 1981 was the low point for Cadillac engineering. GM's Displacement on Demand road test, an interesting take on the same concept: http://www.pickuptruck.com/html/stories/gmctech/three3.html -----Original Message----- From: Henry S. Winokur [mailto:[EMAIL PROTECTED]] Sent: Thursday, December 26, 2002 9:26 PM To: [EMAIL PROTECTED] Subject: Re: Airbox mods > The Caddy you're referring to was the 4-6-8, a V8 with an electrically > actuated MECHANICAL device which allowed or prevented actuation of some I was under the impression that it was an simply an electronic switch which turned off the fuel injection into those unnecessary/unneeded cylinders. Regards, Henry S. Winokur 94 GTS1000, R1100RT-P, AMA, MRF, Nationally Certified Riding Instructor Columbia, MD Ride for Kids Task Force West Bethesda, MD USA The information contained in this e-mail including any attachments may constitute Corvis Corporation Proprietary Information that is subject to Non-Disclosure Agreement and cannot be disclosed to any other party without the express consent of Corvis Corporation. If you are neither the intended recipient of this e-mail nor responsible for delivering this e-mail to the intended recipient, note that any dissemination, distribution, copying, or retention of this e-mail is prohibited. If you believe you have received this e-mail in error, we request that you notify the sender by return e-mail and then delete this e-mail and any return e-mail immediately.
