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This is a great example of the legendary Boss 429 that is considered among the rarest and most highly value muscle cars of the generation. Originally made in a batch of 1359, it's more than a treat to get to run into one of these incredible machines.
The Boss 429 was originally built to compete with the 426 Hemi that was built by Chrylser in NASCAR's Grand National Division. Due to rules from NASCAR, Ford was required to build at least 500 cars with the motor and sell them to the public. Eventually Ford decided to use the Mustang as the means for this homologation.
The origins of the Boss 429 engine live in the earlier 385. It used four-bolt main caps, a forged steel crank and forged steel connecting rods. The engine featured aluminum cylinder heads, with a semi-hemispherical type combustion chamber which Ford called the "crescent". These heads used the "dry-deck" method, meaning the coolant circuit for the block was separate from the cooling circuit for the head. The goal of this method is to strengthen the enginer block through removing the open coolant jackets in the cyclinder and improving the cooling capabilities. In every cylinder, individual sealant o-rings were used to seal the oil and water flow. While a head gasket is still used, the purpose is only to seal the cylinder for combustion so as to not compromise the others should a failure at some point occur.
The Boss 429 originally sported a Holley 4-barrel carburetor rated at 735 CFM. This was attached to an aluminum intake that was a very effective design for its time. The 69 came with a hydraulic camshaft vs the mechanical lifter on the 1970 model.
To fit the new engine into the Mustang's engine compartment, Ford had to work with Kar Kraft to modify the previous model of the Cobra Jets. Kar Kraft was a Ford exclusive experimental facility that functioned as Vehicle Engineering for Ford's Special Vehicles. Kar Kraft had previously developed the first GT40 MKII (winner of the 1966 24 Hours of Le Mans) and designed and built the GT40 MKIV (winner of the 1967 24 Hours of Le Mans).
The first plant to build the new Boss 429 was in Brighton, MI and began work in 1968. The cars were delivered here from the Ford Rouge plant in Dearborn. Both the new engine compartments and the updated front fenders were built at the main Rouge plant, which allowed them to be built well and produce a stronger overall assembly.
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