that depends on the cast of the block , year it was cast , and what it was originally meant for. you can check for the casting number on the passengers side rear of the block (i believe). if it is there it will be just below the cylinder head. once you have that number you can go to fordtrucks.com , do a little research and you will be able to find out what the specs on that particular motor are. keep in mind that the specs you will find are for stock(factory) motors. if there are any performance mods then this will affect hp/tq. aside from all of that you can just go to your local dyno equipped facility.
460 horsepower
500 horsepower
The Ford 460 cubic inch engine came with several horsepower settings. The typical 460 cubic inch Ford engine had a 330 horsepower rating.
380 hp
Around 190 horsepower the problem with any 460 past about 1974 is that they have the emission style heads on them, they are very restrictive, so not much horsepower out of one.
what engine?
Around 200
The horsepower of a Ford 460 cubic inch engine is dependent upon several different factors. The standard horsepower rating was approximately 260.
They come with 505bhp so around 430-460 whp
how much horse power
250
The "460" indicated it has an E-series motor rated at 460 horsepower. Some of the horsepower options changed with the 2007 emissions regulations, but traditional Mack options were 460 horsepower, 427 horsepower (these would both have that number on the side) 400/405 horsepower, 380 horsepower, and 350 horsepower. For a while, there was a 500 horsepower V8 motor offered, but it was only available for a couple years before being discontinued. And there was a 485 horsepower motor offered, and I believe it is still available, but cannot say 100% for certain. Most OTR Mack trucks will have the 400, 427, or 460 E7 motor, although there are some OTR tractors which have the 350 - St. Germain Transport out of Quebec operated CH-613 tractors in their fleet which have the E-Tech 350 motor, and 4:11 rear ends.