What was Chevrolet's smallest big block?? - Chevelle Tech
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post #1 of 69 (permalink) Old Mar 30th, 20, 11:50 AM Thread Starter
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What was Chevrolet's smallest big block??

As the title asks, what was Chevrolet's smallest big block?? And what was its displacement in liters?? I was perusing a slideshow today on the world's largest engines. Number 9 on the list is something they call the Godfather. It is loosely based on a Chevrolet big block, but displaces 1,005 cubic inches (or 16.5 liters). The slideshow states that Chevrolet's big block initially displaced 5.7 liters (which I think it wrong information).

So, if any of you can answer this question, your input will be greatly appreciated. Thanks in advance.

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post #2 of 69 (permalink) Old Mar 30th, 20, 11:55 AM
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Re: What was Chevrolet's smallest big block??

The 348 (like a 409) was considered the first big block. GM also had a big truck big block that was in the 360 CI range.

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post #3 of 69 (permalink) Old Mar 30th, 20, 11:56 AM
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Re: What was Chevrolet's smallest big block??

366 CID in a truck block. 5.99 Liters. I think Troy is right; they're thinking of the 348.
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post #4 of 69 (permalink) Old Mar 30th, 20, 11:59 AM
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Re: What was Chevrolet's smallest big block??

For the Mark IV, there a 366, but it was tall deck only. For cars, 396.
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post #5 of 69 (permalink) Old Mar 30th, 20, 12:15 PM
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348 with it funny looking valve covers that also fit 409 I think
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post #6 of 69 (permalink) Old Mar 30th, 20, 12:27 PM
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Re: What was Chevrolet's smallest big block??

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Originally Posted by NickeyChevelle View Post
366 CID in a truck block. 5.99 Liters. I think Troy is right; they're thinking of the 348.
I briefly looked at the article. The author refers to the 1,000 CID engine as a "Rat" motor. However, the engine shares very little with the Mark IV we all know and love. I don't think it will go mainstreem any time soon.

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post #7 of 69 (permalink) Old Mar 30th, 20, 2:54 PM
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Re: What was Chevrolet's smallest big block??

I read an article about engine development and one of the engines they focused on was the Cadillac that replaced their 1950's designed 390 V8 in the mid 60's.When that engine went into development there was no fuel shortage at all so the new Caddy engine was designed to displace up to 750 CID without any major re-design.So I have a feeling the BBC may have been designed for up to 600 CID also when it came out.
But that 1000 cubic inches is a Bigger Block and would definately need a re-design to accomplish that.
Also if I'm not mistaken the 348-409 W motor is considered the 1st design Chevy V8 big block because it is produced on the same bore centers? and uses a similar crankshaft that theoretically could be used in a Mark IV BBC.So it is considered the Mark I or maybe Mark I & II.
(348 is MK1 and 409 is MK2)
Then there's the 63-64 Daytona 500 427 Mystery motor that is the Mark III and then the start of the Mark IV was 1965's Z-16 396 Chevelle SS.

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post #8 of 69 (permalink) Old Mar 30th, 20, 3:40 PM
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Re: What was Chevrolet's smallest big block??

Quote:
Originally Posted by 71350SS View Post
Also if I'm not mistaken the 348-409 W motor is considered the 1st design Chevy V8 big block because it is produced on the same bore centers? and uses a similar crankshaft that theoretically could be used in a Mark IV BBC.So it is considered the Mark I or maybe Mark I & II.
(348 is MK1 and 409 is MK2)
Then there's the 63-64 Daytona 500 427 Mystery motor that is the Mark III and then the start of the Mark IV was 1965's Z-16 396 Chevelle SS.

The "Mystery Motor" 427 is the MK II. It has traits from both the MK I and IV engines. If you turn down the mains .250", a 454 crank it will fit a 409 block and stroke it into the 480's range.



The MK III is completely unrelated to the previous and post versions of a BBC.
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post #9 of 69 (permalink) Old Mar 30th, 20, 9:59 PM
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Re: What was Chevrolet's smallest big block??

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Originally Posted by shovelrick View Post
348 with it funny looking valve covers that also fit 409 I think
If you had good valve springs in the 348's that engine would RPM like crazy.
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post #10 of 69 (permalink) Old Mar 31st, 20, 9:08 AM
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Re: What was Chevrolet's smallest big block??

how about the gmc v12? the thunder? jim

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post #11 of 69 (permalink) Old Mar 31st, 20, 2:56 PM
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Re: What was Chevrolet's smallest big block??

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Originally Posted by Jim Mac View Post
how about the gmc v12? the thunder? jim

From everything I have understood, that was a poor design and lasted a very short time,
They were used in VERY big trucks (I remember them in oil field service). The block and crank were one-piece castings, but they had 4 separate heads instead of 2. A wierd monkey for sure!
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post #12 of 69 (permalink) Old Mar 31st, 20, 4:20 PM
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Re: What was Chevrolet's smallest big block??

I agree, the smallest big block is 396 in cars and 366 in trucks & busses.

GMC had it's own line of V6 based low RPM gas truck engines. The camshaft in these engines sat in a bath of oil. Spark plugs were in the top by the intake manifolds.

My friend's machine shop rebuilt a 305 V6 a few years ago, gaskets were pretty difficult to find.

The Twin-Six was available in pickup trucks to big road trucks.
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Last edited by paul bell; Mar 31st, 20 at 4:42 PM.
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post #13 of 69 (permalink) Old Mar 31st, 20, 4:29 PM
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Re: What was Chevrolet's smallest big block??

Wasn't the Big GMC V6 (305?) basically a Big Block? like of that V12 mentioned.

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post #14 of 69 (permalink) Old Mar 31st, 20, 4:36 PM
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Re: What was Chevrolet's smallest big block??

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Originally Posted by Pioneer4x4 View Post
Wasn't the Big GMC V6 (305?) basically a Big Block? like of that V12 mentioned.

No. The GMC V6 line was it's own animal. The 401 V6 wast the largest under the Twin.

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post #15 of 69 (permalink) Old Mar 31st, 20, 4:42 PM
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Re: What was Chevrolet's smallest big block??

Twin-Six specs
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