Hello, Greg, maybe you can help me. I have a 1966 Comet Cyclone GT. It is a factory lightweight with the fiberglass hood and trunk. It might have the mag bumpers too, but I’ve never had it checked. My Comet is a “Q code” and comes with the dual quad medium riser setup.

However, it has the 390 NASCAR factory balanced and blueprinted engine with a rare AC Cobra rear carburetor ordered by Ford. The president of the Ford Club said it is one of six factory race cars, but there are no records at Mercury. Any information would be much appreciated that you can offer. Dave Kacprzynski, via email.

A: Dave, one thing is for sure. If this is truly a factory race car and one of six produced, you are sitting on a serious collector car. Also, I’m not surprised that the president of the Ford Club told you there are no official records over at Mercury, as back then the brand was very involved in drag racing and even produced the first ever full body fiberglass funny cars, notably the 1966 Comet Cyclone GTs campaigned by Eddie Schartman, Don Nicholson and Jack Chrisman. The team of Kenz & Leslie also received one, and these four cars were the true forerunners of the full body funny cars.

With all this said, I can’t recall any “NASCAR” 390 engines, but I’m not saying Mercury didn’t offer one. Most all Ford and Mercury engines back then were the 427 inch side oilers, produced and successfully campaigned by numerous top teams. The 390 is a good engine, and produced 335 horses back then with a four barrel carb. It was a sibling to the Fairlane, and competed with the Chevelle, Olds 442 and Pontiac GTO in its GT form.

Checking the Q-code, this letter in 1966 “normal production” nomenclature relates to a 428 engine, not a 390. However, back then, factories did a lot of things under the table when it came to racing, (see attached advertisement) resulting in your “not offered to the public” dual quad 390 (with the special order AC Cobra four barrel). I would suspect that your car is one of the six final A/Factory Experimental cars produced by Mercury in 1966, thus the different induction, fiberglass and engine in your car.

Cyclone GTs, even in normal production dress with the 335-390 in 1966, command top dollar these days. Notable, too, is that Indianapolis 500 Pace Car that year was a Cyclone GT. Additionally, I was lucky to see in person Dyno Don Nicholson run his car in 1966 at Atco Dragway in Jackson, N.J. I’ll never forget that night of nitro and seven other funny cars.

In ending, your car, as the Ford Club president noted, is a very race piece of history. Take good care of it.

Greg Zyla writes weekly for More Content Now and welcomes questions on collector cars, auto nostalgia and vintage motor racing at 303 Roosevelt St., Sayre, PA 18840 or email at greg@gregzyla.com.