H.P. difference between 360 & 401

Old Rugged Crosser

If one were to build a 360 and a 401 identically. What would the be the diff. in h.p/ torque?

jeepsr4ever

I may be going on a limb but I am going to say 41 :D

tufcj

You can build them using the same parts, but the changes won't be identical. The 401 moves a bigger volume of air per stroke, so even with the same cam, head work, and intake/exhaust, the 401 is going to benefit more from each improvement. It's all going to depend on what parts you put into it. Bob tufcj

fifesjeep

With everything there are always limits and one of those limits for an AMC V8 just happens to be the heads. Though, You can still produce great streetable numbers with them but, they just lack the larger lift/flow characteristics that one would want for a higher hp motor. IMO when building a 401 and a 360 to Identical specs (Besides bore and stroke) the philosophy "No replacement for displacement" rings true. A cam for the 401 might not work as well with the 360 and vice-versa... It's best to build each motor specifically.

Old Rugged Crosser

jeepsr4ever;128796 wrote
I may be going on a limb but I am going to say 41 😃

I don't comprehend

Old Rugged Crosser

Old Rugged Crosser;128795 wrote
If one were to build a 360 and a 401 identically. What would the be the diff. in h.p/ torque?

In cubic inches, I find that the 360 is 89.775% of the 401. 10% of 401 is 40.1

Is the nominal output of the 401 10% greater than the 360? Being built the same would this follow?

jeep_man_401

A simple way I would use is to, find out the hp per cubic, then multiply it by the cubic inch size of the engine in question. I believe there are just to many variables.

Old Rugged Crosser

Thanks Jeep Man, How are the eyes doing? Been praying for the best!

Mudrat

ORC - there is a program out called "Desktop Dyno" that would be more accurate than most of us could say. Unless somebody actually has built identical motors and dyno'd them we're guessing and like Jeep_Man said, "There's too many vaiables."

A write up on the Desktop Dyno software:
http://www.hotrod.com/techarticles/engine/desktop_dyno_engine_simulation_software/index.html

There is also another program from www.martelbros.com. One of the racing sites say's this about it:

"The program they have is unbelievably accurate...they only thing I dont like is that you cant input dual pattern cams, and I think it is a little too dramatic in its predictions for changes in cam lobe centerlines. I have tried this program on several of my buddies cars and was shocked at how accurate the program is though. I also have the desktop dyno and dyno 2000 (plus the related drag programs), and the engine analyser and drag analyser programs...i think desktop dyno is a bit optimistic in its predictions and engine analyser is a bit conservative. I think you can get a demo of engine analyser at www.performancetrends.com"

wyrmrider

I've run 360's 360's destroked to 305 401's stroked to 427 and destroked to 305 They can ALL put out the same horsepower But at very different RPM ranges, different torque curves They are all limited by cylinder head flow (ain't we all) The AMC heads flow better stock than most all ported stock small block Chevy's (the early kind of the same vintage- not the new stuff Not quite as good as the good Buick 455 GS heads but close