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The 6.2 is a 379 cubic inch with a 4.01 bore with a 3.74 stroke motor. I grew up in the muscle car days and back then we considered the 289, 302, 289, 327, 340, 351W to name a few small blocks. When you got into the big bore motors like the 351C, 390, 427, 383, 440, 348, 396, 454 then they where big blocks, many of the big blocks shared the same block but longer strokes to make bigger displacement. So back then you would open up the hood and see a small motor like a 289 and it was small compared to a 351C so it was a small block.
I consider the 6.2 a big bore short stroke motor and when you get on it that's what it sounds like and it looks big under the hood.
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The Bore Spacing is typically the determining factor.
Ford traditionally had three different bore spacings for their V8 engines:
4.38" was a "Small Block"
4.63" was a "Medium Block"
4.90" was a "Big Block"
That was further broken up into tall deck and short deck blocks. For example, Ford's old 302 and 351 (Windsor or Cleveland) both had a 4.38" bore spacing, but the former was a short deck block, while the latter was a tall deck block. Taller deck meant a longer possible stroke, which meant greater displacement without moving to the next bore spacing.
When they introduced the Modular Engine Family, the main characteristic of that family was a 100mm bore spacing. The 4.6L has it, the 5.0L coyote has it, the 5.4L has it, even the 6.8L V10 has it. In English measurements this would be a 3.937" bore spacing, making it essentially a smaller than small block using the old naming system.
Of course the problem you run into with the Modular family is that your bore spacing limits your displacement. Even with a tall deck block you're still limited to about 5.8L in a production Modular V8 engine. Hence why they had to create the 6.8L V10....it's essentially a 5.4L V8 with two more cylinders added.
Since everyone else was moving to 6+ liter V8's in various applications, Ford felt they needed a new engine design to be competitive. That required a different bore spacing, which then requires a completely new engine family. Hence why the 6.2L is from the "Boss" family and not from the "Modular" family, even though they share a lot in common.
Now the Boss engine family uses a 115mm bore spacing, which would be 4.53".
Here is the bore spacing on some other engines:
Chevy Small block (both traditional and modern LS family): 4.40"
Chevy Big Block: 4.84"
Chrysler/Dodge A and LA Small Block: 4.46"
Chrysler/Dodge B and RB Big Block: 4.80"
Modern Hemi Small Block: 4.46"
So where does the Boss engine family fit in? At a 4.53" bore spacing it's not a big block in the traditional sense. It's not really a small block either. It's closest to a medium block, though like the Modular family, it doesn't quite match the bore spacing of Ford's old medium block.
I guess, with all the true big blocks gone from regular production, we could say the 6.2L is a modern big block, but I feel like that would be confusing and just a little too inaccurate.
Maybe if Ford brought out a production version of the Boss engine with more than 428 cubic inches I could be swayed. That's about where the old medium block family stopped and GM's new small block stops at 427ci for a production engine. I think a new Boss with about 460ci would be just perfect. They could use it in the F650 and maybe a limited edition F250.
They are actually closer than a glance would indicate. The F150 is rated on premium fuel where the SD is rated on 87 octane. The Ford engineer stated way back the SD was very close to 400 hp on premium fuel. Not sure what they did though to make that extra 11 or so hp.
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Yes. It is the biggest block I have owned! LOL Before the current truck, my F150 had a 5.4 which was .4 liters more than any other V8 I owned. Ford 302 and Chevy 305. Everything else was a V6. If I were to purchase an inline 4, I would not know what to think of it. I would probably say where is the other half of the engine! LOL
2011 F250 XLT CCSB 4X4, 6.2L V8, 6R140, 3.73 Elocker, Cooper Discoverer A/T3 LT275/70R/18, Lariat Rims, Premium XLT, Chrome, FX4, Camper, Plow packages, ESOF and Powerscope mirrors Tuxedo Black Metallic
2008 Kodiak 30BHLS Travel Trailer
2005 Ford Explorer XLT 4x4 V6 4.0, 5RE55, 3.73LS
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