How much Horsepower does a 289 mustang make stock?

Question

I have 65' and I don't know how much it makes

Answer 1

It's gonna make a big difference if it's original. Depends on how early the production run was. The early '65s came stock with the 260 small block v-8. Mid-year Ford bored out the 260 to make them 289c.i.d. Same block, bigger bore. They went from 3.8 to 4.0. The 260 was rated at 164bhp and the 289/1bbl at 200bhp. The newer production 289 was fitted with a 2bbl and gave 225bhp and a 4bbl option with 271bhp. Not bad considering it's a 2600 lb car.

Answer 2

I've answered this several times, but here it is again.

They had 200 hp with the 2 barrel [C code], 225 hp with 4 barrel [A code] and 271 hp[ K code] HiPo and the Shelby GT350 had 306 hp using a modified K code HiPo.These are all factory horsepower ratings for the 65-67 289 cu in engine.

There was even one sold with the 289 K code and Paxton supercharger rated at 390 hp!

These were all gross hp readings from the factory

Toolman made a couple of errors, so I'll give you the early models as they vary, first you have the 170 ci, 105hp U code, then the 260 2v 164 hp Fcode, then the 289 4v D code with 210 HP. These are called the 64 1/2 early models and the codes can be found in the serial number and stamped on the top of the fenders., it's the last letter.

There is a lot more information on these Mustangs in the group below.
(v=carb size)

Answer 3

289 Mustang Engine

Answer 4

1965 Mustang Horsepower

Answer 5

The 4-barrel car (K-code) was officially rated at 271 HP Gross, and the GT350 version was rated at 306 HP Gross.

The 4-speed car's got more horsepower to the ground than automatic car's. So net horsepower will vary from there.

Only way to be sure is to put it on a Dyno and have it checked.

Answer 6

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Answer 7

2 or 4 barrel

Answer 8

K code had solid lifters