any advantages of a 427 over 454 - Team Camaro Tech
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post #1 of 30 (permalink) Old Jan 7th, 05, 01:21 PM Thread Starter
 
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Hey guys I have always wanted to build a 427 because to m understanding they make big block torque, but also rev pretty fast. My questions it there any advantage of a 427 over a 454? Will I be sacraficing a lot of power if I could with a 427 compared to a 454?

Also does anyone have any good 427 combos to but a full weight 56 Belair in the 11's?

thanks
Tom
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post #2 of 30 (permalink) Old Jan 7th, 05, 02:02 PM
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In a car like a 56 use the biggest engine you can afford. They are heavy have a very good frame and will transfer weight (traction) with out a lot of work. If you want some race only specs I can get you into the 10s with a 427 but it won't be streetable with 92oct. gas.
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post #3 of 30 (permalink) Old Jan 8th, 05, 06:22 AM
 
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27 cubic inch bigger motor!

And if your 454 core motor has a bad crank, you can make a 496 out of it for not all that much more money over keeping it a 454 and then make alotta easy, BIG, power!!

You can get 550 hp out of a 496 pretty easy and it is still real streetable, just like a stocker with a mild solid cam....

Just use at least 1/4" longer aftermarket rods to make balancing it a lot easier AND cheaper!!

Been there, done that...

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post #4 of 30 (permalink) Old Jan 9th, 05, 07:54 AM
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Yea, but on one is answeing his real question? Which is faster, a 427, or a 454, in comparable "stock" factory high performance trim, with a few typical add-ons? I've also wondered this. 427's were always (or seemed to be, at least) high revving engines at the drags. 454's, on the other hand, were typically known as stump pullers, with no need to rev them high. What's the truth? Are 427's that much better revvers than the 454, or is it more "old wives tales"?
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post #5 of 30 (permalink) Old Jan 9th, 05, 08:04 AM
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Who can answer that 'real' question. What would you use as 'real' data or 'real' results? I wonder how a 427 got the rep as a high revving motor while a 454, with 6.6% longer stroke is deemed a 'stump puller'? Does 6.6% more stroke make that much difference?
My drag racing analyzer likes the 454 to the tune of about a tenth.

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post #6 of 30 (permalink) Old Jan 9th, 05, 03:52 PM
 
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Or back up in time and take a look at the infamous 430" BB motors that were 4.44" b x 3.47" s if not mistaken? From what I have read, it was good for an extra 100hp over a regular 427 but really don't know for sure..

It WOULD run rings around a 427 motor but was "dirty" smog-wise...

That's why Chevy went with the 454??

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post #7 of 30 (permalink) Old Jan 9th, 05, 04:23 PM
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I don't think there is really any difference if you are building a street motor. I think the 427 got a rep as a high RPM motor, from the L89/L88's that were stuck in Vettes from 66-69. Yes, those things revved to 7k but I wouldn't think they were all that streetable or reliable with '60's technology of the day. Probably explains why there aren't that many around today.

If you want a BBC to rev to 7k you can do it with either, but you need to buy the right components to make it all work. You will still be facing streetability issues because having something that revs that high, will more than likely mean it is a bit of a dog way down in the low rpms.

PDQ67 is right, if you have a 454 it doesn't take a lot of work to make a 496 and then you have the ability to make a whole lot of power at not that high of revs. Thus you will have a pretty streetable motor. Of course your mileage will pretty much suck, but does it really matter.

Either motor is real easy to make 400-500 hp without making it strain to hard. So....it depends on what you want to do and what you want to spend.

I would think building a 454 would be cheaper overall because there are more parts available and you don't have the high initial cost of acquiring an original 427 block. Now you can make a 427 out of 454 by using a smaller crank. I believe Competition Products sells a 3.76 forged crank (it is a GM Crank by the way) for cheap (250-350?) that will make a 427 out of a 454. So I think it just depends on what you want to do with your motor.
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post #8 of 30 (permalink) Old Jan 9th, 05, 04:33 PM
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I think its like in small blocks: 327 vs. 350 and big blocks 427 vs. 454 !

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post #9 of 30 (permalink) Old Jan 10th, 05, 05:38 AM
 
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Ok here's the deal. HP is related to TQ. The 427 is good for a light car or one that traction challenged. But dollar for dollar the cubes will win every time.
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post #10 of 30 (permalink) Old Jan 10th, 05, 06:28 AM
 
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Yes, the old saying always wins out!

"Cubic money beats cubic inches!!"

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post #11 of 30 (permalink) Old Jan 10th, 05, 12:57 PM
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but 427 sounds so much cooler and fits the age and style of a Camaro. The numbers 427 ring with ground pounding drag racing legends like ZL1's and Vetts. The numbers 454..........the first thing I think of is a 1 Ton Chevy truck beat to crap hualing a load of firewood out of the woods.

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post #12 of 30 (permalink) Old Jan 10th, 05, 01:54 PM
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Put a 496 in it and call it a 427.Back when people street raced not that I would have all bigblocks were 396s and all smallblocks were 283s.

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post #13 of 30 (permalink) Old Jan 10th, 05, 05:10 PM
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The more I think about it, there may be another reason the 427 was a "race" engine, while the 454 was a "truck" engine. I believe it was due to the cubic inch restrictions placed on engines by the sanctioning bodies (NASCAR,NHRA,etc)in the early days. Thus a "real" race car always had a 427 Chevy, or a 426 Mopar, or a 427/429 Ford, at ALL the major racing events that most people were familiar with (Daytona 500, Winternationals, etc).No one ever saw 454, or 440, or 460 on ANYBODYS fenders or hoods, at any time! No wonder the 427 got the "bad to the bone" reputation, while the 454 languished in the shadows. Just my opinion, but I really think that's what happened.
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post #14 of 30 (permalink) Old Jan 10th, 05, 05:40 PM
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454??? I think of LS6 450hp from the factory in a 70 Chevelle SS. Truck engine

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post #15 of 30 (permalink) Old Jan 10th, 05, 05:49 PM
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Yes the 70 LS6 Chevelle was badazz no confusion there. But it was for year only and it made to go away.

taillights I think summed it up why we all think (or some of us think) the 427 just sounds like pure brute big block racing power. They are those mystical numbers that ledgends were made of.

Joe

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