Hi everyone,

My 1976 F-100 has a built-up 390 which had the original 360 I pulled out. So the question is, if I were to change the 360 into a 410 or bigger, just how much more horsepower and torque would it have if any over my 390 I'm running now? I'm happy with the 390 now with the Edelbrock aluminum parts, cylinder heads and intake. The 410 would have the same set-up if I were to build it. Can I build it bigger than a 410 and is it a waste of money or is there a difference in the two?

Thanks a lot.

 

with the chinese cranks coming out you have several options from what I can tell 3.98-4.375 strokes. Cant say I'd bother unless you needed the towing grunt or wanted to break a land speed record.

 

OK, this will bring out better minds, but this is my WAG.

Say you leave everything the same and just increase the displacement. What will happen is the power curve will move down the rpm scale. More low-end grunt and a broader torque curve and probably a smoother hp curve.

Assume you have coaxed 1 hp per cube out of your 390. The 410 should still approximate that hp level, so you are probably going to see 410 or so hp.

Your mileage may vary.

Someone here has probably already done this and will chime in.

 

I'm no expert in engines. I'm just tired of my current "tired" engine and seek a completely new engine. I have a '79 one ton truck that has an 8' wide x 15' long flatbed and require a strong torque engine too haul its weight.

A 410, after my research performed, is an ideal candidate for my use. It is the same engine as your 390, but a 428 crankshaft, shorter connecting rods and is externally balanced via your flywheel or flexplate (depending is you use a manual or auto trans.)

I currently don't have this engine, just a pipe dream for now, so I won't be able to throw you some figures. But one question you'll have to ask, do you want to do burn-outs, or heavy hauling?

Tyl

 

Same rods for both, no difference there.

 

Have your 360 block checked by a reputable shop and see what the thoughts are on the max bore you can safely take it too. From there, you can build away.. I doubt you will see a stark difference in your built up 390 to the 410, but if you were running the 360 still, that would be different.

--Mike

 

Thanks for the input everyone. It sounds as though a 390 can about match a 410 engine in power. I'm happy with my 390 and all the work that went into the project. I think building a 410 from a 360 at this point would be a waste of time and money. It's just an F-100 4X2 and the built-up 390 can really light-up the tires if needed. That's why it's no surprise my friends call it a tire frier.

 

even if you just go by the book a 410 has about 15-20 more horses and 20 lb/ft of tq more than the 390 and those figures are definitely underated. not to mention all that is further down the power band aka more streetable. If you already have it apart why not. but then again I would love to have that 4.375 crank! that would be one bad fe! but if you can actually settle for just what is needed then more power to you!

 

In stock form the 390 4V in a car was 300hp @ 4600 and 427 lb/ft @ 2800 while the 410 4V was 330hp@ 4600 and 444lb/ft @ 2800. so there are you base line comparisons.

 

I've driven both the 390 and the 410 & in similar and even the same vehicles and there was no power or torque difference you could read in the "seat of the pants meter".

 

A couple of observations. Those are pre-'72 gross HP figures. Some say take 80%. OK, there is still a difference, 410 wins. And I agree that those look like the numbers I remember from reading the owner's manual over and over again in our '66 Country Squire.

But look at the numbers.

390, 300 horse. Approx .77 hp/ci

410, 330 horse. Approx .80 hp/ci

So how to you pick up 30 horse from 20 ci? Those new horsies were 1.5 per ci?

So, not just a grain of salt needed here, but perhaps one of those Morton 50lb blocks we used to put out for the cows..... Not for your posts mind you, but just for our idea(s) of what a 390 vs. 410 put out.

 

Thanks for the clarification there cause I just about chit myself when I read that LOL was all geared up to go over here...

 

I think I found a 428 crank for close to $350 Cnd shipped. What does it mean when it's 30/40?

Tyl

 

428's = 1966/70 various Ford & Mercury models as an option (Galaxies, LTD's, Fairlanes, Birds, Torino's, Mustangs, Marquis, Parklanes, Montego's, etc.).

410's = Standard equipment on full sized: 1966 Mercury Parklane / 1967 Mercury Parklane/Brougham/Marquis. Optional on the Monterey models. Not available for Comets, Montego's, Cougars. 410's were not used on any Ford model.

410 compression ratio: 10.5:1. The same as like 390's 4V's from the same time period.

The 5th digit in the passenger cars 11 digit VIN (thru 1979) is the engine code. 1966/67 full sized Merc's: 410 = M.

 

Not "officially" anyway