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Old 01-16-2008, 10:36 AM
Alan Byers's Avatar
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454 into 427

Hey there,
I have that 65 Malibu project. I have a 454, 4 bolt.
As you guys know the 454 has a 4.00 stroke and the 427,
396 has the 3.76 stroke. I was tossing the idea around of
making my 454 into a 427 because of the shorter stroke you
would obtain quicker pedal responce because of faster RPM's
via shorter stroke.
Idealy(sp) it would be nice to just leave the low compression
piston, block, stroke etc...alone and waste my money on a set of
Edelbrock performer aluminum heads and I would get just about
the performance level I am seeking with a nice intake, 850 dbl pumper,
headers, mild cam
I guess my question is: would I have to get a new 427 crank,
3.76 rods and new 427 pistons or do I only need new 3.76 rods
with new 427 pistons? keeping my forged 454 crank??
OR...? am I just wasting my time and money and should just
retain what I have, throw some compression pistons in my 454
and put my 049 heads on it???
Thoughts.
Thank you in advance.

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Old 01-16-2008, 10:46 AM
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I have the exact setup your asking about. My block is a 454 block, crank is actually a 366ci truck crank (same stroke as a 427), using 6.135 rods and then Ross Blower pistons. The rods are going to be the same whether it be a 454 or 427 it's the piston that is different..
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Old 01-16-2008, 10:55 AM
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THere may be some issues with the internal and external balancing of the two engines, if you have an internally balanced 454...which I dont think they made a lot of. Then you won't have a problem.

But back to your original question but you will have to change the pistons and crank in order to make your engine a 427. I have a forged GM 427 crank I am not using if you want it

I think that if you are going to change the crank and pistons anyways you should turn it into a 496. It will cost you the same and will give you lots more low end torque.
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Old 01-16-2008, 10:55 AM
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427 from 454

thanks for the advice.
So..can I conclude that what I need
to go from 454 to 427 is new 427 pistons
with new 396 or 427 crank only??? leaving
the rods alone and at the same length??
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Old 01-16-2008, 11:00 AM
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You will want to use the 427 crank not the 396 because the counterweights are different and you will have to add boo koo weight to the crank to get it to balance correctly, also see my edit above on the 496
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Old 01-16-2008, 11:03 AM
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making a 427

double V23
thanks for the imput.

My engine is the 78-90 454 casting# 14015445
and mine ended up being a 4 bolt which was lucky.
so I do not know if it is internally or externally balanced.
I would assume it is externally. It has the huge harmonic
balancer. I thought only 396's were internal?? anyway.
Not sure what route I want to go now. My 454 is sitting
in my frame on mounter mounts with the lousy stock heads
and low compression ratio. If I do nothing but put it back together
I will have a boat anchor with no HP what is ithe point. So I want to
do something and a 65 Malibu, 427cu.in, Muncie 4sp, 12 bolt posi
sound like a nice cruiser. BUT making the 427 I need advice????
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Old 01-16-2008, 11:03 AM
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Quote:
Originally Posted by Double_v23
You will want to use the 427 crank not the 396 because the counterweights are different and you will have to add boo koo weight to the crank to get it to balance correctly, also see my edit above on the 496
The 427, 396, 366 cranks are all internally balanced, and all the same stroke, the only difference between the 427 and 396 was the block, why would you add boo koo weight - I didn't have to. Also whether it's an external/internal balance, the block itself could care less.

Check on the flywheel and dampner for a counter weight, if one is on there, then it's externally balance, if not, it's safe to assume it's internally balanced. You can't run an internally balanced crank with external dampner and flexplate and vice versa.

Last edited by BlownBigBlock447; 01-16-2008 at 11:09 AM.
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Old 01-16-2008, 11:13 AM
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454 into 427 or 496

thanks again everyone for your thoughts. I do not
know enough to debate.
Re:to "496" is that a stroker kit that you buy? and how
much $$ roughly?
Let me throw this at you guys. Leave the 454, 4 bolt
buy new higher compression pistons, stronger rods, aluminum
heads and go with that set up???
I have a subscription to HotROD mag and all it takes is money
right? and you can do what you want. But like many of you guys maybe
I am not rich, but am a mechanic and have put a lot of engines togther.
BUT...I do not know a lot.
anyway
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Old 01-16-2008, 11:22 AM
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Quote:
Originally Posted by BlownBigBlock447
The 427, 396, 366 cranks are all internally balanced, and all the same stroke, the only difference between the 427 and 396 was the block, why would you add boo koo weight -.

On the 427 one of the middle counterweights is 3/4" thick and on the 396 the couterweight is only 5/8" thick. This compensates for the difference in the weight of the bigger 427 pistons, your 366 crank was a tall deck with bigger 4 ring pistons so it also has the bigger counterweight (which is why you didn't have to add weight). A 396 will have to have serious heavy metal added to it, to get it to balance

You are right the block could care less. But the guy buying the crank/dampner/flexplate, and paying 225 for the balance and 15 dollars an ounce for heavy metal might.
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Old 01-16-2008, 11:23 AM
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Quote:
Originally Posted by Alan Byers
thanks again everyone for your thoughts. I do not
know enough to debate.
Re:to "496" is that a stroker kit that you buy? and how
much $$ roughly?
Let me throw this at you guys. Leave the 454, 4 bolt
buy new higher compression pistons, stronger rods, aluminum
heads and go with that set up???
I have a subscription to HotROD mag and all it takes is money
right? and you can do what you want. But like many of you guys maybe
I am not rich, but am a mechanic and have put a lot of engines togther.
BUT...I do not know a lot.
anyway
Alan without knowing quite what your after, if this is strickly for the street, just recon the rods, put in some ARP rod bolts and you'll be fine. You will need a higher dome piston if you want higher compression if your staying the 454. Head wise, unless your weight consious, guys are pulling good numbers with early 70's oval port heads. Buy a pair on the cheap, get matching components, have somebody do some work to them and I'm pretty sure you're going to be happy with the end result without breaking the bank.
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Old 01-16-2008, 11:33 AM
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Quote:
Originally Posted by Alan Byers
Re:to "496" is that a stroker kit that you buy? and how
much $$ roughly?
They range in price from 800 to 3000 bucks depending on what you want to do with the motor.

http://cgi.ebay.com/ebaymotors/BB-Ch...em200190691096

This is a good kit and you would need flywheel and dampner and have it balanced so you would be looking at 1500 bucks...BBC cast cranks can handle quite a bit, like 600 hp and 6500 rpm. So unless you plan on running more than that a cast crank will work just fine...forged rods are more important than a forged crank in a long stroke application.
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Old 01-16-2008, 11:37 AM
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454 to 427

thanks "blownbigblock447"
I have a set of 049's that I am going to get rebuilt.
I like your ideas. This block has a tin tag onthe drivers side
that say "REMANUFACTURED AC DELCO for GM" says
.010" over on crank, .030" on bore. it is a pretty stout block.
Going with you idea. I could just buy a set of dome pistons
say .025"-.050" do the ARP bolts, throw on my 049's with some
bolt ons and go..???
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Old 01-16-2008, 11:42 AM
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I agree.We built a 454 .030 over with flat top pistons and a healthy cam.We put some older 396 hi perf heads on it and it is in my son in laws 65 Chevy truck with 3.73 gears and a TH400.It performs very well and also revs up quickly and smoothly.We had a reputable local machine shop do the boring and had it balanced. I can get the specs from my son in law tonight if you want. I say the more cubes the better. Just build the 454 with flat tops and good heads and cam. It will save you money and it will fry the tires anytime you want.You can put 427 stickers if you want and nobody will know.
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Old 01-16-2008, 11:44 AM
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That is all good, But if you do decide to do something with the crank, I would highly recommend one of those kits...I have a 496 and it is fantastic.

That is how I ended up with the extra 427 crank.

Anyways good luck with your build, like he said you will be very happy with the results.
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Old 01-16-2008, 12:10 PM
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While I'm a big fan of a 427, You can't beat cubic inches. The rotating assembly as well as other factors will influence how quick you can rev due to the weight difference. If I had a 454 I would stick with it, I don't see the point in going down the ladder and spending more money just to lose 27 cubic inches. I would only do so if I was racing in a class that had a cubic inch limit.
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