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Vintage Mustang Concours Tech Questions Answered: Boss 302 Interior Fasteners
Boss 302 Interior Fasteners
I’m the original owner of a Bright Yellow, Dearborn-built 1970 Boss 302 (0F02G129864, built November 5, 1969) with black interior and without the Sport Deck rear seat. I have two questions I hope you can give me guidance on. Prior to my car’s restoration I took many photos, but failed to take any that would answer these.
First, I am trying to determine the correct finish of the screws for the plastic interior pieces. I have Jim Osborn’s Interior Assembly Manual. On most sheets that are dated before June 26, 1969, it calls out an S9 finish (sharp silver), but the Kick Panel Sheet TO-510 dated June 26, 1969, and the Folddown Rear Trim Panels Sheet TO-525 dated November 14, 1969, state that the S9 finish is only for use with light and dark red interior colors, with S2 (phosphate and oil—I’m guessing with a gray rather than black finish) to be used for all other dark interior colors. What screw finishes at the previously mentioned locations would be appropriate for my black interior and build date?
Second, inside the trunk, I know that the bolts connecting the trunk lid springs to the body were painted black along with the springs, but were the bolts connecting the trunk lid to the spring arms also painted black or left natural? (I guess it depends on whether the underside of the trunk lid was or was not painted black prior to bolting it to the spring arms).
Via the internet
Clear zinc is the typical finish for the listed items. I have seen dark S2 screws on a Metuchen 1970 Boss 302 with Ginger interior used on rear panels; however, my 1970 302 with Ginger interior has clear zinc screws. I would use the typical clear zinc screws unless you have pictures to show otherwise. The decklid was painted on the car, so the bolts were painted black as well.
More Boss Fasteners
I own a 1970 Boss 302 Mustang. I’m currently detailing the engine. I have all the original intake manifold bolts and I’m reusing them, but I can’t tell the original finish due to deterioration. Are they zinc or phosphate and oil? Also, which intake holes use the two studs?
The intake bolts are clear zinc (silver). The two intake studs are zinc dichromate (gold). The studs are located on the left side of the engine (the driver’s side) on the first and fourth holes. The first is used for the rev limiter ground and the fourth for the shaker bracket. I've supplied a picture for reference.
Boss 429 Shock Detailing
I recently found an original set of Boss 429 rear shocks (PN C9ZX-18080-A) at an old speed shop here in Birmingham. These are correct for my 1970 Boss 429. The shocks had been cleaned up many years ago and were painted white. I know they should be semigloss black. What was the paint daub color code applied on these shocks? I have most often seen orange.
You hit the Boss 429 lottery! You have a rare find and a keen eye. Original Boss 429 shocks were painted semigloss black. The identification code is one red and one orange paint daub. I have enclosed a picture of an original-paint C9ZX-18080-A for reference.