396-427 Cranks in a 454 Block. - Team Camaro Tech
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post #1 of 24 (permalink) Old Apr 11th, 08, 09:31 PM Thread Starter
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396-427 Cranks in a 454 Block.

Can anyone tell me if you put a 396 Crank in a 454 Block is it still conceder a 396.

If you put a 427 Crank in a 454 Block then it would be conceder a 427.

It doesn't mater about the size of the heads.

Thanks may sound like commonsense but im just checking.

Thanks Skeeter

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post #2 of 24 (permalink) Old Apr 11th, 08, 09:37 PM
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Re: 396-427 Cranks in a 454 Block.

Engine size is determined by the displacement of the engine. If you destroke a 350 into a 265, now it IS a 265.

If you make a 454 a 396 then its a 396. Same as if you make a 454 a 502. Its now no longer a 454, its a 502.

Its the size of the motor INSIDE that determines what it is. You can dress a 400 small block and make it look like a 283 if you want. But its still a 400.

And on your example I dont "think" you can put the 396 crank into a 454 block. I seem to remember the main journels being smaller. Not sure though.


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post #3 of 24 (permalink) Old Apr 11th, 08, 09:43 PM Thread Starter
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Re: 396-427 Cranks in a 454 Block.

Thank you im just trying to find out what i have, Ive ben told that it is a 454 with a 427 Crank & Heads. But i never checked, it is very snappy and spins up to 6,500 to 6,800 RPMS. Thanks and i would love to hear any other inputs.

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post #4 of 24 (permalink) Old Apr 11th, 08, 09:48 PM
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Re: 396-427 Cranks in a 454 Block.

A 396 and 427 crank are the same. a 396 crank in a 454 block (4.250 holes) equals a 427. Here is a link that you can surf through for some time and find out all about bore/stroke combos plus engine and head castings among other things.

http://www.mortec.com/borstrok.htm


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post #5 of 24 (permalink) Old Apr 11th, 08, 09:57 PM Thread Starter
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Re: 396-427 Cranks in a 454 Block.

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Originally Posted by dubs68camaro View Post
A 396 and 427 crank are the same. a 396 crank in a 454 block (4.250 holes) equals a 427. Here is a link that you can surf through for some time and find out all about bore/stroke combos plus engine and head castings among other things.

http://www.mortec.com/borstrok.htm
Thanks guys now that is what i was looking for..... Awesome job

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post #6 of 24 (permalink) Old Apr 11th, 08, 10:10 PM
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Re: 396-427 Cranks in a 454 Block.

427 and 454 are the same bore and a diferent stroke. 427 is the same block with a different stroke. So if you have a 454 with a 427(3.76) crank, you have a 427. If you have a 454 with a 454(4.00)crank you have a 454. 3.76 crank(stroke) are in 396s 402s, and 427 etc.. 4.00 crank is in 454 502 etc.. All these motors are the same size (bbc)but with different bores, and strokes. Hope that made sense.

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post #7 of 24 (permalink) Old Apr 11th, 08, 10:11 PM
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Re: 396-427 Cranks in a 454 Block.

sorry fellas i was typing the same time yall were.

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post #8 of 24 (permalink) Old Apr 11th, 08, 10:33 PM
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Re: 396-427 Cranks in a 454 Block.

Here is a really good page describing bore vs stroke on BBC

http://www.roadsters.com/bbc/#bore

Size Bore +.060" Stroke
366 3.935" 3.995" 3.760"
396 4.094" 4.154" 3.760"
402 4.125" 4.185" 3.760"
427 4.250" 4.310" 3.760"
454 4.250" 4.310" 4.000"
502 4.468" 4.530" 4.000"

Merlin/Dart block with 4.626 bore and 5" stroke 672cid

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post #9 of 24 (permalink) Old Apr 11th, 08, 10:44 PM
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Re: 396-427 Cranks in a 454 Block.

Skip read my last post in your last thread titled "427 Crank" about this topic ))

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post #10 of 24 (permalink) Old Apr 11th, 08, 11:01 PM
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Re: 396-427 Cranks in a 454 Block.

there are two different size cranks 3.76, and 4.00 but they are not all interchangeable because some have different counterweights for different bore sizes. Correct me if im wrong on this one. In other words you cant use a 396 crank in your 454 to make a 427. Im not 100 percent on this one.

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post #11 of 24 (permalink) Old Apr 11th, 08, 11:17 PM
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Re: 396-427 Cranks in a 454 Block.

justincat:

I've read that too but have compared a 396 crank to the 427 crank and saw no differences. I have built a 396 crank/454 block 427 engine for a client with no issues; however, you may be right that some 427 or 396 cranks exist with different counterweights that might interfere with the assembly, eg: piston skirts and perhaps balancing. All the ones I've seen have appeared identical to me. The 427 Tall Block crank might be different but I can't say as I've never worked on one.

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post #12 of 24 (permalink) Old Apr 11th, 08, 11:19 PM
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Re: 396-427 Cranks in a 454 Block.

cool thanks for the info Ron

68 camaro, 350 vortec heads, rpm air gap, lunati voodoo cam, coated headers, th350, 100 shot, 3.73, eaton posi.

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post #13 of 24 (permalink) Old Apr 12th, 08, 12:21 AM
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Re: 396-427 Cranks in a 454 Block.

Justin go to this site: http://www.mortec.com/cranks.htm

You will note the 396, 402 and 427 crank shafts share the same Casting numbers eg:

6223.........396,402,427...forged, 1053 steel
7115.........396,402,427...forged, nitrided, cross-drilled, 5140 steel
3804816....396,402,427....cast

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post #14 of 24 (permalink) Old Apr 12th, 08, 04:56 AM
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Re: 396-427 Cranks in a 454 Block.

None of the cranks have counterweights that will interfere with the pistons, ALL factory big blocks use 6.135" rods. A true 396 crank is supposed to have a couple of counterweights that aren't as thick as those on a 427, but I've never seen one. Balance would be the only difference. You can drop any crank in a 4.250 bore block - the 3.76 stroke will give you a 427, a 4.0" stroke gives a 454. The only problem you might have is dropping a 454 crank into a 396 block, there may be interference between the crank throws/rod ends and the block since the 4.0" stroke didn't exist when the 396 blocks were cast, but you should be able to grind it away and get clearance.

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post #15 of 24 (permalink) Old Apr 12th, 08, 05:36 AM
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Re: 396-427 Cranks in a 454 Block.

Without modification you can also install the 3.25" stroked CHEVY 348 "W" crank (or the longer stroke 409 crank) into a Mark IV 4.25" bore 427/454 block. Displacement was around 369 cubes and it was the 302 screamer version of a BBC. Connecting rods with a specific length had to be used to accommodate the wrist pin placement (compression height) of either the 427 or 454 piston because there are no pistons for this combo. These engines were built by those who dared. If I recall correctly the engine used a Ford 460cu 6.605" connecting rod which was resized to length for the Mark IV deck height. It had a "n" Ratio of approx 2 which is a little more then the Mopar 340 and did not require big ports heads to achieve hi-revs. Do not confuse the "W" 348 or 409 / 427 Z11 3.65" stroke engine with the Mark IV engine - That 369cu example was a mechanics hybrid and not in the books - I'm bored just thought I'd share that with you - but I've probably opened a can of worms - LOL

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Last edited by Z15CAM; Apr 12th, 08 at 08:44 AM.
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