I just got my hands on a 460 for my 1978 F150. I am going to rebuild it since it is all stock from a 1977 F250 Camper Special. I found a forum that has different builds for different horsepower. I'm wanting to build 325-350 hp but wondering how much torque will it produce. This is my daily driver and has been since 2012 and the 351M just ain't cutting it any more. I also tow a trailer right at about 5000 lbs every once in a while. Truck is an C6 automatic with 4wd. This is the info.

325-350HP 460ci

Intake System:
Holley 750 vacuum secondary
Edelbrock Performer (non-Rpm) Intake Manifold

Cylinder Heads:
Heads can be D0VE or D3VE with mild port job
(315-ish/180-ish cfm @.600)
Intake valve size 2.08
Exhaust valve size 1.65
Stock rockers

Short Block:
Comp Cam Custom Spec Hydraulic flat tappet cam or equivalent
Based on the Xtreme Energy Hydraulic Series
Intake Lobe 5430 and Exhaust Lobe 5232
(Specs:250/268 adv., 206/218@.050, .479/.493. lift, 110 LSA)
Compression around 9.0:1
Stock crank
Stock rods
Standard volume oil pump
Stock oil pan

Exhaust:
1.75" headers to dual 2.5" pipes with H-pipe. Good flowing 2.5" Magnaflow mufflers or equivalent.

Summary:
91 octane. Horsepower peak at 4,500 rpm. Keep redline to 5500 rpm.

 

Torque and temperature are measured...horsepower and windchill are calculated. Run it on a dyno to really find out. Torque X RPM divided by 5252 = HP. Run the formula to solve for torque instead of HP...plug in whatever RPM you want...gives you the torque at that RPM. Using this formula, torque and HP must necessarily be equal at 5252 RPM.

 

Gee! Thanks for that info. It really helps.

 

350 HP at 4500 RPM is 408 ft/lbs

Hard to say what the lower rev numbers would be, but my wag is in the low to mid 400s somewhere in the lower revs.

You can put in numbers and get something of an idea here, keeping in mind the max HP number is at 4500. If it only makes 250 hp at 3000 RPM, that's still 437 lb/ft.

https://spicerparts.com/calculators/...que-calculator

 

Awesome! Thank you. That's what I was looking for.