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  #1  
Old 12-22-2009
Binderboy Binderboy is offline
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big block or small block

Hey all!
I was just wandering if the 392 is considered a big block or a small block engine?

Thanks,
Jim in central IN
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  #2  
Old 12-22-2009
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Jensers Jensers is offline
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Re: big block or small block

I dont know - what makes a big block?

The 392 and the 345 can swap heads - so the block isnt 'bigger' I guess.

Dont forget the 304 as well.
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Old 12-22-2009
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WRENCH MAN WRENCH MAN is offline
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Re: big block or small block

The 266, 304, 345 and 392 are the "SV" (SMALL VEE) engines in the IH world, they make the "MV" (Medium Vee) series and an "LV" (Large Vee) series also, so they are the SMALL blocks from IH, even though they rival most Big Blocks in physical size!, the "MV" are bigger than the "BIG BLOCK" engines and the "LV" engines are absolutely HUGE!
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Old 12-23-2009
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Re: big block or small block

I cant remember if I seen the MV 404 in a loadstar or a S1800, Never seen a LV.
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Old 12-23-2009
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gerickson gerickson is offline
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Re: big block or small block

Here is a pic of a MV446. I put this in my 200.
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Old 12-23-2009
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Re: big block or small block

Now that I think about it, the 6.9 and 7.3 diesels are patterned off of the "MV" series, so if you've ever been under the hood of a Ford with a diesel in it you've seen an MV.
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Old 12-24-2009
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Re: big block or small block

The MVs, especially the 404, was pretty common in the Loadstars, the early S series and buses. The LV was used in the larger over-the-road trucks. The 549 is massive.
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Old 12-24-2009
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Re: big block or small block

The MV537 is a massive motor too. Noticably larger than a 404/446. I have located a 537. Just haven't got the owner to sell it to me yet. It weighs like 1200lbs. My 446 weighs 970lbs with the bellhousing.

I had an IH guy tell me that 304s thru 392s were considered big blocks due to stroke. Don't know if this is true... Just what I was told.
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Old 01-07-2010
Allan Allan is offline
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Re: big block or small block

Big block and small block are terms used to describe big 3 engines. They really don't apply the same way to the IH engines, because the weight to displacement ratios are so much higher.

The SV series weighs about the same as a 454 chevy, plus or minus. They are the "small" IH gas engine, compared to the "big block" GM engine, but they have low displacement by comparison. If you go by size and weight, they are "big block" engines. They are used in scouts, pickups, and travelalls, so comparing them to the blazer, pickup, and suburban engines, that would be the criteria, I suppose.

The big 3 engines rev up quicker. They have higher rpm capability from the factory, and they use lighter duty parts. The crank on an IH engine is steel. Steel is available on a big 3 crank, but it is an option. The IH engines have long connecting rods. This gives a mechanical advantage against the crank, less side loading to the pistons, typical of diesels that move big loads. More low end torque was the goal.

The blocks on the IH engines are designed to handle more twisting forces. This is because they are made to be used in dump trucks, school busses, etc. My dump truck came originally as a grain truck with a 304/4 speed. It had a lot of rough miles on it during its working life. My fire truck came with a 304, according to the line set ticket, but it sure looks like a 266, with no engine ID on the pad. Haven't torn it down yet. Both are 3 ton trucks with 5 ton cargo capacities. The fire truck has a GCWR of 29K and an empty weight of 13K. That's 8 tons of carry/haul for a 304.

Try that with a "small" block, like a 305 chevy or a 302 ford.

Anyway, small block and big block are just terms for cars and the pickups that use car engines, so you can call the IH engines whatever you want and it's probably right.
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