Small Block & Big Block Chevy Specific - Generation III 427 Vs. BBC 427?

How do they stack up against each other in a STREET driven car? Ported heads and cam from 230 duration to 250 duration? Give your opinions? :nod:

There is no comparison, the GIII is all new technology, liteweight, and production power is equal to or better than an old iron headed, heavy, big block.

Now as far as installation goes, an old school motor is alot simpler to install and make run.

Not to mention a 427 Big block must be getting very hard to find, and the new 427 will be easily available, but at a price.

Why do people compare 427 sb vs bb???? 454's are a lot easier to find. Not to mention that for the price of a 427 gen III you could get 500+ cubes in a bbc.
Do you have something against cubic inches??? j/k
Seriously, when you compare sb vs. bb, you should compare what you would be able to afford to each other, not "427 sb or 427 bb"....
ok end rant. Sorry but I'm not sure how many people have asked this already in the last month. I think you guys know my opinion.

I was meaning as far as from a performance level. In other words how would a late 60's model chevelle, camaro etc. with a bbc hold up against a 427 Gen. III? Similar cam, heads, gear etc. :engarde:

ok.
I'm not sure but I think the gen III would be better, as with that small of an engine I don't think the heads on a sb would limit it much.....but I'm not sure so don't take my word for it. :D

454's are a lot easier to find. And throw a 396 crank and rods in it and you've got yourself a 427 :)

No comparison. Gen III 427 wins hands down agains ANY BBC stock for stock!

No comparison. Gen III 427 wins hands down agains ANY BBC stock for stock!
They made a STOCK gen III 427?
Well I guess if you're going to use the word stock that loosely then I would say a 572 would handle that 427 pretty well. :D
Ahh I'm just givin' ya a hard time. :)

No comparison. Gen III 427 wins hands down agains ANY BBC stock for stock!
:loco: Must have never owned a BB

They made a STOCK gen III 427?
Well I guess if you're going to use the word stock that loosely then I would say a 572 would handle that 427 pretty well. :D
Ahh I'm just givin' ya a hard time. :)
:lol:

No comparison. Gen III 427 wins hands down agains ANY BBC stock for stock!


Yeah but in a street driven car I think for the money the BB would be the better route... just my .02

Gen III, Gen IV its all the same to me :)

BTW the compare the new ls7 and the 454 ls6 (original) and you might be surprised what a big block could hold up. :D

Comparing horse and wagon to jet fighter IMHO! The Gen I 427 against ANY BBC from the sixties (yes it is a STOCK engine) will win hands down in terms of power and driveability. Yes I have my flame suit on ;)

Comparing horse and wagon to jet fighter IMHO! The Gen I 427 against ANY BBC from the sixties (yes it is a STOCK engine) will win hands down in terms of power and driveability. Yes I have my flame suit on ;)
You mean gen IV there, right?
Well let's see:
gen IV ls7 427 makes 500hp and 475tq
mkIV ls6 454 had factory rating of 450hp and 500tq

Now when you factor in that the 454 was underrated and actually made in excess of 500hp(as any owner of one will tell you), you see that there isn't a huge difference other than a few extra lb-ft of torque and the 454 weighs about 250 lbs more.
Given the same conditions, they would be about even. So there isn't as big of a difference as you thought. :)

You mean gen IV there, right?
Well let's see:
gen IV ls7 427 makes 500hp and 475tq
mkIV ls6 454 had factory rating of 450hp and 500tq

Now when you factor in that the 454 was underrated and actually made in excess of 500hp(as any owner of one will tell you), you see that there isn't a huge difference other than a few extra lb-ft of torque and the 454 weighs about 250 lbs more.
Given the same conditions, they would be about even. So there isn't as big of a difference as you thought. :)

Given the fact that the 450 was GROSS HORSEPOWER rating (which is 70-80% that of net horsepower ratings) the difference is even greater. I am sure that the 500 NET HORSEPOWER of the LS7 will be an under rated number just like any other LSX engine ;) The LS7 is the most powerful production engine chevy has ever produced. PERIOD! So there is a much bigger difference than you thought :nod:

And yes I meant Gen IV (not Gen I)

who would win? A ls1 camaro with a 427 or a 1st generation camaro with a 427 BB? compare similar set-ups?

who would win? A ls1 camaro with a 427 or a 1st generation camaro with a 427 BB? compare similar set-ups?
Of course ste ups matter. The advancement in suspension and tire development is substantial since the first gen. f bodies.
Even with the older suspension some of the 427 camaro's were guaranteed to run 11's if you bolted on slicks, even with all the extra weight a 1st gen fbod would have over a c6 that is very impressive.
It doesn't really matter though because I never intend on using a STOCK big block of any kind ;) :D
You have a valid point though, METALBEAST. :cheers:

Of course ste ups matter. The advancement in suspension and tire development is substantial since the first gen. f bodies.
Even with the older suspension some of the 427 camaro's were guaranteed to run 11's if you bolted on slicks, even with all the extra weight a 1st gen fbod would have over a c6 that is very impressive.
It doesn't really matter though because I never intend on using a STOCK big block of any kind ;) :D
You have a valid point though, METALBEAST. :cheers:

Its awesome to have such a civil discussion on the matter with you pwr2w8 as opposed to the mudslinging and name calling that usually happens on internet forums:cheers: Kudos to you brother ;)

Its awesome to have such a civil discussion on the matter with you pwr2w8 as opposed to the mudslinging and name calling that usually happens on internet forums:cheers: Kudos to you brother ;)
Thanks, I was afraid it was going to turn to that, but I guess I chose the right person to argue with. :lol: :cheers:

BTW Would you have guessed you've been arguing with a 16 year old? I find it amazing when grown men resort to name calling and other childish tricks in an arguement. But it's always nice to have it stay leveled. :)
I guess I got kinda :owned: on the stock vs. stock point but what if we argued modified?..... :jest: :D

BBC al day looonnnnggg more streatable than a stroked sbc.

I think you would have to make the comparison of the two a little more level and either convert the BBC to Fuel Inj, or convert the LS7 to a Carb. I do think that the F.Inj. vs. Carb will make a difference in the streetability, particularly in varying weather conditions. Fuel. Inj. has the drivability in my experience. Put carbs on both, and then compare the hp/tq, idle quality, acceleration, etc. I think in that case, the aluminum block will probably come out a little better just based on weight, and the cam profile the roller gives. The BBC can provide more power for less money though. Wouldn't turn down either, just depends on the look and feel you want vs. what your wallet/wife/girlfreind will support.

Small displacement BBCs are a waste of time. Once you start talking about 572+ CID BBCs 1000hp NA becomes pretty simple to do.

I got tired of reading all the posts, alll i can say is...

APPLES AND ORANGES

It is olmost like comparing men to women, completely different creatures.

Given the fact that the 450 was GROSS HORSEPOWER rating (which is 70-80% that of net horsepower ratings) the difference is even greater. I am sure that the 500 NET HORSEPOWER of the LS7 will be an under rated number just like any other LSX engine ;) The LS7 is the most powerful production engine chevy has ever produced. PERIOD! So there is a much bigger difference than you thought :nod:

And yes I meant Gen IV (not Gen I)


apples to oranges yes
new technology is much more efficient
but the 450hp gross rating for the MK4 was actually taken at 4500rpm and not at max power/rpm closer to 7000rpm which comes out to somewhere in the neighbourhood of 580hp depending on whos dyno you use.