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Does anyone know of a Cougar produced in 72 with this engine? Some call it a High Output.
I have seen a 72 Mach 1 with this code and air cleaner verbage. The owner is saying that these were left over Boss 351 engines and could be ordered special until they ran out. Maybe 300 engines were available?????
 

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Not according to Kevin Marti.

There were 398 R code Mustangs in 1972 though.
 

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Part of the confusion is that Mercury offered the 72 cougar with 2 versions of the Q code engine. there was the 351 4V - and the 351CJ - Exact same engine the difference is

351 4V was equiped with the "Special Quiet Exhaust" Basically longer - more restrictive mufflers
351 CJ was equiped with the "Sporty Exhaust"

Both versions had unique D2WY part numbers and neither version interchanged with the Mustang.
 
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