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Vintage Mustang Concours Technical Questions Answered
Boss 429 Engine ID
Bob, I found a 1970 Boss 429 engine, and I’m looking to mate it with a car here in Arizona. I would like to look up the original Kar Kraft “KK number” that matches the VIN number without having to buy a $400 book for a one-time use. The number on the block is OF143254. I hope you can find the KK number for me. Thanks for your help.
Via the Internet
Randy, According to the KKX 1970 program Vehicle Log Book we have here at the shop, the VIN 0F143254 on the engine belongs to Boss 429 KK2543.
G.T. 500 Brake Calipers
I would like to determine if the front disc brake calipers are original to my father’s 1968 G.T. 500, which was built February 20, 1968. Both single-piston calipers have the FoMoCo logo cast into them.
The right caliper has the number 248 cast on the piston side, while the non-piston side has a circle with an “A” 6, 775. The left caliper has the number 268 cast on the piston side, while the non-piston side has a circle with an “A” 7, 775. All the numbers appear to be cast, not stamped in the casting. I found no other numbers or letters. I was wondering if these are the original calipers to the car. My dad has owned the car for the past 38 years and never replaced the calipers. We are very good friends of Dave and Mark Robinson from Bellevue, Ohio. We have been longtime subscribers of Mustang Monthly and enjoy your “Resto Roundup” column each month. We appreciate all you do in the Mustang world.
Typically the 1968-1969 Mustang Kelsey Hayes disc-brake caliper has an assembly date stamped in the machined surface, as pictured here. In this example, it is the 323th day of 1968 with the KH logo. This would be most accurate date code to verify if it’s original to the car.
Boss 302 Spoiler
I recently sold my 1969 Mustang Mach 1, and while cleaning out the attic and garage of extra parts, I found this used Boss 302 chin spoiler I had acquired for my Mach 1 and never installed. I’m trying to determine the year of the spoiler so I can sell it.
Via the Internet
Looking at the images you supplied (shown here), it appears you have an original 1970 front spoiler. The 1969 and 1970 spoilers are completely different in the way they mount to the front valance. Although they appear the same, fitting a 1969 spoiler to a 1970 will not be correct, and vice-versa. Good luck with the sale.