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Boss 429 piston found at machine shop

Ultra-rare part being used for a restoration
Posted April 23 2013 11:06 AM by Nikolas Kolenich 
Filed under: Miscellaneous, Ford, Performance Parts, Car Engine

Boss 429 Piston

This is a Boss 429 piston we spotted at JMS Racing in El Monte California. It's stamped with "FoMoCo" and the aluminum rod is stamped "M/T" as in Mickey Thompson. It is for a factory '69 Mustang restoration.


In 1969 there were 859 Boss 429s made by the Ford Motor Company, two of which were Cougars for the Lincoln/Mercury Race Division. Each car had a manual transmission and no air conditioning due to under hood real estate. Some early models were known as "S" code cars due to their slightly different engine. The "S" code cars had magnesium valve covers. Also, the Boss 429 or "Boss 9" did not have traditional head gaskets; the 429 motor had O-ring heads which were known to be the weak spot on the engine. 



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