351M ?

[1971fordcustom]

does any one know how much HP a 351M Ford engine has? all I know it came out in the
smog wars when the US GOV was on automakers butt. My new 1971 Ford F-350 has that engine.

[ToughOldFord]

I'm no help here, but that's a damn good question. All my Ford books that list HP for various engines ALL say N/A under the 351M and 400 engine. I've never found an answer.

[sideoilerfe]

The 351M wasn't made until 1975 so someone swapped it in. Those engines are crap. The 400 is ok if you want to spend a lot of money on it you can make them pull pretty good. If you've got a 1971 then I'd find an FE to bolt in.

[hazelnut]

429/460 has the same bolt pattern and would make a better swap.

[ak-1970-360]

I have a book titled The Ford Chronicle, I cannot remember who wrote it and since im sitting on the couch with a broken leg i really cant go find it. If i remember correctly it says that the 1978 351M was rated at 158bhp, however i do not understand what is meant by BHP but the whole book uses this rating and for some engines like the 428 Cobra Jet it says 335bhp which is the correct rating.

[papabug71]

BHP is "Brake" horse power. I think it is basic HP, with no drivline or accessory losses.

VIA WIKIPEDIA :

Brake horsepower is the measure of an engine's horsepower without the loss in power caused by the gearbox, alternator, differential, water pump, and other auxiliary components such as power steering pump, muffled exhaust system, etc. Brake refers to a device which was used to load an engine and hold it at a desired RPM. During testing, the output torque and rotational speed were measured to determine the brake horsepower. Horsepower was originally measured and calculated by use of the indicator (a James Watt invention of the late 18th century), and later by means of a De Prony brake connected to the engine's output shaft. More recently, an engine dynamometer is used instead of a De Prony brake. The output delivered to the driving wheels is less than that obtainable at the engine's crankshaft.

[1971fordcustom]

The 351M wasn't made until 1975 so someone swapped it in. Those engines are crap. The 400 is ok if you want to spend a lot of money on it you can make them pull pretty good. If you've got a 1971 then I'd find an FE to bolt in.

I know it got put in the truck! I've been after this truck for the past year! LOL
It did have a 360 but it thrue a rod! so the guy had one of his other engines put in it.

I dont wanna change any thing I Just wanna know HP. The engine runs great! Brand new 4BB Carb new Distributor, New Electronic Ignition,

[1971fordcustom]

BHP is "Brake" horse power. I think it is basic HP, with no drivline or accessory losses.

VIA WIKIPEDIA :

Brake horsepower is the measure of an engine's horsepower without the loss in power caused by the gearbox, alternator, differential, water pump, and other auxiliary components such as power steering pump, muffled exhaust system, etc. Brake refers to a device which was used to load an engine and hold it at a desired RPM. During testing, the output torque and rotational speed were measured to determine the brake horsepower. Horsepower was originally measured and calculated by use of the indicator (a James Watt invention of the late 18th century), and later by means of a De Prony brake connected to the engine's output shaft. More recently, an engine dynamometer is used instead of a De Prony brake. The output delivered to the driving wheels is less than that obtainable at the engine's crankshaft.

[papabug71]

I would guesstimate 150-160 HP at the crank. They were super-smogger motors, so dont expect alot of HP from it without some serious mods/cash. They are just like any other ford V8. They respond well to basic mods, intake, exhaust, mild RV cam, good ignition, etc. A new timing set will help it out as well. The factory timing set was retarded 8*. (I think).

[papabug71]

A group of the full size Bronco guys here in town have done some builds on the 351M & 400's. They seem to be just fine for a low geared 4x4, & they say most of the time people will dang near give them away.

After talking with the above mentioned guys, I have a new outlook on the 335 series motors.

[1971fordcustom]

See my DRW Flatbed is a LowGear n its a hualin Truck so low end torque is good for me