Mustang MonthlyHow To Tech Qa
1970 Boss 302 & 1969 Mach 1 - Resto Roundup
Concours Expert Bob Perkins Handles Your Restoration Questions
Snorkel StampsIn the Shaker detailing article in the March '05 issue, we omitted the samples of the artwork used to duplicate the engineering number stamped on the air-cleaner duct and valve (snorkel) for the '70 Boss 302 (D0ZF-9D626-B) and '69-'70 428 Cobra Jet (C80F-9D626-B). The color of the ink is white.
Added Originality ValueI'm in the process of slowly restoring a '66 Mustang, which is already in fairly good condition. My question is, how much monetary value does using historically correct items, such as belts and hoses, add to the car, if any? I need to replace them now and would like to know if the extra cost is worth it in the long run.Tim WilliamsonVia the Internet
I always recommend original Ford parts, if you can find them at a fair price. I also believe you get your money back when you sell the car because of the increased value due to the original parts. The worst scenario is to buy parts twice to upgrade your restoration. Reproduction parts have little or no value after you remove them to replace them with original parts.
Original parts help the value of any first-generation Mustang. Some will benefit more than others having original Ford belts, hoses, and so on. For instance, if you had a '69 Boss 302 with 4,000 original miles and it had reproduction belts, hoses, tires, carpet, and such, I would wonder why a 4,000-mile car has all those reproduction parts. Why pay a premium for a low-mileage Mustang if it's equipped with a lot of non-original components? For a 4,000-mile Boss 302, original parts would be important to most collectors.
Another prime example is a '65-'66 Mustang GT. It's hard to prove you have a real GT if it's equipped with a reproduction gas cap, fog lamps, fog-lamp grille bars, etc.
Remember the old slogan about genuine Ford parts being "made right." They also fit right, last longer, and score more points at concours events.
Quarter-Panel PaintingRecently, a detailing question about factory paint was posted on one of the Mustang Web sites. The question was, did the rear quarter-panel end caps on '70 Mustangs, as in a Boss 302, get painted off the car? The consensus was split. In your opinion, what items were painted off the body on a Boss 302?Tom WeberSt. Louis, MO
At both the Dearborn and Metuchen assembly plants, the quarter-panel extensions on Boss 302s were painted on the unibody but slightly back from the normal fit position, resulting in paint coverage on the edge of the quarter-panel and extension with no tape lines. The extensions were later removed and gaskets installed on the extension before adjustment for final installation. Shown here is a photo of a '70 Boss with the quarter extension removed for reference.
The '70 Mustang unibody was painted with the doors, decklid, rear valance, and quarter-panel extensions "hanging" on the unibody. The hood, fenders, cowl, fender extensions, front valance, and panel between the headlight buckets were painted off the car. However, special-order colors sometimes did not follow this pattern.
All racing mirrors were painted before assembly and, of course, off the car. Special-order-paint cars were supposed to get chrome mirrors because of the racing-mirror paint and assembly procedure. Again, this was not always the case. Special-order requests in the '60s and '70s were handled much different from today.
'69 Spoiler BracketsDid a '69 Mach 1 come with brackets for the rear decklid spoiler? I bought a set of the brackets that go under the decklid. They are L-shaped but have a big, round spacer welded on them. Am I supposed to drill a hole into the decklid bracing to accommodate this spacer or should I install my spoiler and decklid without the bracket?Joe KleinVia the Internet
The '69 Mustang did not use the '70-style spoiler reinforcement bracket in the decklid. The '70 decklid has factory cutouts for the brackets. The '69 rear spoiler used four bolts for installation, rather than the four studs and nuts on the '70 spoiler.
The '69 spoiler is a rare find. Only the '69 Boss 302 offered the option from the factory. The rear spoiler was not a factory option on the Mach 1 until 1970. However, it was possible to order a '69 rear spoiler as a dealer accessory for the Mach 1 after the April 1969 introduction of the Boss 302. To be truly concours correct, a '69 Mach 1 should have the '69-style spoiler rather than the '70.
Down To The Gasket DetailsI have a question that will probably be considered a little off the wall by most readers. I was told by an older gentleman at the Mustang Club of America's Mustang 40th Anniversary Celebration that he could tell that the head gaskets on my '66 GT350 were aftermarket and not original Ford gaskets. My first thought was, Does anybody really care? But the more I thought about it, the more I wanted to know how or if you can determine if a gasket is OEM Ford or aftermarket, especially after it was installed on the engine and painted.
I have restored the Shelby to trailered concours specs and then some. I've used N.O.S. parts wherever possible. I even found an N.O.S. Rotunda oil filter and air-filter element. When putting together the engine, we used Fel-Pro head gaskets. I'd like to know if I made a concours (visual) mistake.Name withheld by request
There is a verifiable difference between genuine Ford 289 head gaskets and the currently available head gaskets. The correct Ford part number is C3AZ-6051-C. In the front corner, there is a circular hole in the gasket that protrudes from the cylinder head. This small detail is one of the things sharp judges often look for. Until this is published, I doubt that more than a few Mustang owners knew or even cared about details like this.
On the other hand, these details drive us crazy as we improve our cars to the next level of authenticity. Often, no one except the car owner will ever know some of the small details we do that sometimes aren't visible when the engine and car are assembled.