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Depends what engine it has- in 78 only the straight 6 and 302 V8 were available the 351 V8 was dropped---it was only available from 75-77
The 1978 Ford Mustang - 302 - 2 barrel carburetor - is rated at 134 horsepower at 3400 RPM and 250 ft-lbs torque at 1600 RPM
220 horsepower for the high output 302 in a 1988 Ford Mustang
225 horsepower
According to my Chilton's Auto Repair Manual : The 302 V8 in a 1978 Ford Mustang II is rated at ( 134 horsepower ) from the factory ( it doesn't specify for California with that size of engine )
it comes with a 302 ,360 ,411 ,365 horsepower engine
215 horsepower ford 302 v8
210 horse
Around 230 gross hp
A stock 302 engine with a two barrel Carb has 210 horsepower and 300 lb ft of torque, with a four barrel, 230 horsepower and 310 lb ft of torque.
185 bhp
There is no such thing as a 1972 Boss 302 mustang. They were made in 1969 and 1970. They had 290 horsepower but it was (according to some at Ford) under-rated.