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Old 01-29-2005, 07:45 PM
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Big block?

Isn't a chevy 396 a big block. A destroked 400, not a really bored and stroked 350. Right? Me and my friend were discussing this. He says a 396 is a small block, I siad it was a big block. Who's right?

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Old 01-29-2005, 08:04 PM
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Not a chevy guy but I believe 396 is indeed a big block.
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Old 01-29-2005, 08:06 PM
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396 is a big block. It was its own make.


Copy from this web site

Quote:
Of course, a new generation of big-block V-8s made a big impact in the '60s as well. The 396 made its debut in 1965, and was a standout performer in Corvette trim, pumping out 425 hp. A 375-horse version made it into a select few '65 Chevelle's (Z-16s), and by '66 the SS396 package was a big seller in the Chevelle line. A larger, 427-inch big-block added more heat to the 'Vette that year, paving the way for the legendary L88 the following few years. The big-block eventually grew to 454 cubic inches, and by 1970 cranked out 450 hp in LS6 trim.

The 396 was its own make. The 400 are small blocks with Siamese bores giving the added room to put a 4.1 bore. The 396 was the smallest chevy Big block I know it's a werid set up to have a small block be more CI then the BB but thats how it is.



Chris

Last edited by strikingthematch; 01-29-2005 at 09:14 PM.
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Old 01-29-2005, 08:21 PM
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Just as aside, the caddy 368 is basically the same outside dimensions as a 472 or 500. Now that is a small big block.
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Old 01-29-2005, 10:08 PM
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actually the 366 Chevy is a tall deck big block.. big truck only. also, the 348 Chevy is considered the first big block chevy produced from 58-61.
The 396 is not a destroked 400 . the 396 was the first displacement of the MarkIII big block Chevy introduced in 1965. The 400 Chevy, a small block didnt go into production till I beleive 1969(if Im wrong, Im close).
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Old 01-31-2005, 02:52 PM
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1969 production for the 1970 model year, in both cars and trucks.
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Old 01-31-2005, 04:08 PM
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Thanks for the info.
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Old 01-31-2005, 08:12 PM
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Quote:
Originally posted by stepside454
actually the 366 Chevy is a tall deck big block.. big truck only. also, the 348 Chevy is considered the first big block chevy produced from 58-61.
The 396 is not a destroked 400 . the 396 was the first displacement of the MarkIII big block Chevy introduced in 1965. The 400 Chevy, a small block didnt go into production till I beleive 1969(if Im wrong, Im close).
Stepside454 is correct on the 366 being the smallest production big block. While some parts will interchange on the 348-409 engine and the big blocks, they were a seperate engine design, usually referred to as a "W" engine. Found a site someplace that said Chevrolet had an internal competition among the engineers to come up with a larger displacement engine. There were "W", "X", and "Y" engines entered. The "W" design won.
To add to the confusion, later 396 engines were built with a larger bore, making them a 402. I have seen 402's in cars with 400 badges.
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Old 01-31-2005, 08:19 PM
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proper answer

The 396 is a big block. The bottom is machined for the smaller crank. The 427 and 454 are machined for the larger crank.

The 400 big block as it was referred to by some. Was installed in the higher end Impalas such as Biscaynnes and Caprices in the early 70s.

The 400 big block was actually a 402. It was a 396 with a .030 overbore. The pistons installed by the factory had the .030 stamped right on the piston.

In retrospect the 402 was known as a granny engine and had a bad rep. The reality of the situation was the 402 was actually a more powerful motor than the 396. But we all must worship the SS 396. BAH humbug!

For you 355 guys, the next time you bore your 396 you are actually creating a stock 402.
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Last edited by bracketeer; 01-31-2005 at 08:25 PM.
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Old 02-02-2005, 02:51 PM
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I have been told that the 402 was created because the blocks had gotten rusty prior to assembly. Then were bored to clean up the bores. Myth or truth? I don't know, but it sounds reasonable.
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Old 02-02-2005, 02:57 PM
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I heard something like that...a production problem led to the 402

Not sure where that came from...maybe some real Chevy guys will know and set it straight.


Tazz


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Old 02-02-2005, 03:17 PM
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396 production problems

I found this on http://www.musclecarclub.com/musclec...-history.shtml

Comments: The big change for 1970 was Chevrolet's decision to slightly modify the venerable 396 engine to meet new emission standards. The result was a slight enlargement of the big block to 402 cid although Chevrolet still refered to the engine as the "396" or the "Turbo Jet 400" to take advantage of its name recognition.

http://www.darklair.com/monte/400-faq.html

If the 402 (option code LS3) was installed in a SS Camaro, Malibu, or
Nova, it was known as a 396 (SS 396 apparently sounded better than SS
402). However, if, for example, it was installed in a non-Super Sport
Malibu, then it was known as a 'Turbo-Jet 400", and was identified as
such by a "400" emblem on the front fender.

For some confusion;
The 400 sb was known as the 'Turbo-Fire 400'.
The 400 bb was known as the 'Turbo-Jet 400'.
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Last edited by bracketeer; 02-02-2005 at 09:27 PM.
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