I was just sittin here enjoying reading engine posts and wondered BBC, SBC? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-16-2006, 02:45 AM
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I was just sittin here enjoying reading engine posts and wondered BBC, SBC?

Whats the difference between bbc and sbc engines..........I know it stands for big block chevy and small block chevy, but what makes an engine fit into either of these categorys?

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Old 09-16-2006, 03:01 AM
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The big block is physically bigger and heavier. But not neccesarily bigger in cubic inches. Theres small block 400's and big block 398's. Theres even after market blocks that are small blocks but can be bored and stroked up to, and even a little over, 454 ci
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Old 09-16-2006, 09:26 AM
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Also, BBC heads usually flow quite a bit better due to having larger ports. The size range for a small block is around 262-472 and big blocks can range from around 396 to 632. Another thing is that BBC parts are stronger. Small blocks are lighter, and can be made to make great hp. But for all out power and you cant beat a big block. If you wanted a 550 hp streetable small block, you would need ported aftermarktet heads, a large cam, aftermarket parts in the rotating assembly, and probably at least a 406. The beauty of a big block is that with a stock 454, stock heads with a little porting, a stock rotating assembly with better pistions, a fairly mild cam and an aftermarket intake, you can achieve the same performance with alot more low end torque for less money. Small blocks are good for weight reduction, and they usually get better gas mileage. For cheap power, or the most power possible, It is tuff to beat a big block.

Adam
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Old 09-16-2006, 10:04 AM
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And if you look at the differences between a big and small Mopar, the big block has 5 bolts per cylinder heads where the small has 4. The big has external oil pump where the small is internal. Big has the distributor in the front, small in the rear, big has a skirted block, small does not. There's a few other differences too but not that important. Ya, the big is about 100 lbs more give or take depending on which engine you compare but so what....I'll take the big motor. Oh ya, then there's the Hemi!
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Old 09-16-2006, 02:05 PM
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Without the BBC there would be no SBC.
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Old 09-16-2006, 03:34 PM
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the valve covers are bigger when looking at the two
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Old 09-16-2006, 06:25 PM
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What came first...

The chicken/bbc or the egg/sbc? You tell me...There is a love hate relationship between Rat and Mouse motor owners!!



Tazz
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Old 09-16-2006, 07:41 PM
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dangit

I wish i could fit a 454 into an s10 lol also another reason the smallblock chevy is so popular is that there so easy to find compared to the bbc..well minus the smallblock 400..there alil more scarce...oh well
GOTHROD
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Old 09-17-2006, 02:52 AM
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Generally it's all about bore spacing (centre to centre). Be it GM, Ford, Mopar or Tatra - if it's over 4.4 inches between centres it's a big block.
BTW, Chrysler made 331 inch (hemi) ,Ford 332 (side oiler), Chev 348 (w) and 366(rat) big blocks. All Pontiacs share the same dimensions except deck height (301) so they are all big blocks from 287 to 455 ci.
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Old 09-17-2006, 06:39 AM
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Ok this is going a bit away from the original question, but what the heck, that's already been pretty much answered.

The 331 Hemi was actually the first evolutionary step to what would become Chryslers LA series small block (318, 340 and 360).

With no or just slight modification some parts such as timing chains, windage trays, oil pumps, and bellhousings from LA engines are finding their way on to the early Hemi's.

Take the big impressive heads off and you have a small block.
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Old 09-17-2006, 09:30 AM
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Mopar also has a low and tall deck big block but both use the same bottom end structure. The small blocks are all the same basic block with the crank being longer on the 360 and also has larger mains. Yup, we got away from the orginal question but don't most all threads to that lol
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Old 09-17-2006, 06:16 PM
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Quote:
Originally Posted by tm454
The chicken/bbc or the egg/sbc? You tell me...There is a love hate relationship between Rat and Mouse motor owners!!



Tazz
Look at it this way. Before the BBC nobody called it the SBC. That being true, there were no SBC before 1965. Had a whole lot of fun with that logic at a bar one night.

Last edited by Bob147; 09-18-2006 at 05:37 AM.
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Old 09-22-2006, 08:40 PM
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ok, another fact to throw in for confusion....

Ummmm my 58 Apache truck has a 348 BIG Block in it, make in 1958.

I am sure someone will correct me if I'm wrong, but I understand the 348 to be Chevy's first big block engine??????

....and the 265 was it's first V-8 ?

Steve
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Old 09-22-2006, 08:44 PM
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I believe the 348 and the 409 shared the same block.
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Old 09-23-2006, 03:01 AM
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Yes, the 348 and 409 are both W series or mk1 engines. They both had huge bores and short strokes which needed short gearing to get them revving. MY55 gave us the 265, 1958 and we had the 348, the 409 came out in 1961 (mid year) and the 396 in 1965. Put a 454 crank in a standard bore 409 and you get 481 cubes - big holes!
BTW if you use a L/J 327 crank with bearing spacers in a 400 sbc you get 348 cubes - 4.125 bore x 3.25 stroke.
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