A "427" c7?
Burning Brakes
Joined: Jul 2004
Posts: 874
Likes: 18
From: Texas
You are right, the GT500 runs on 285s. To each his own, but that's not what I want.
The 5.5L is basically confirmed. GM is really no longer being pushed for 5.7L+ larger motors. The new 2014 GMC Yukon/Chevy Tahoe will also have a smaller V8 (probably the same 5.5L as the vette), if you need more evidence...
Last edited by VETTEMANN; Sep 27, 2012 at 10:03 PM.
Drifting
Joined: Feb 2008
Posts: 1,682
Likes: 3
From: Coatesville PA
But... there is 0 evidence. In fact quite the opposite. Do you know where the 5.5 rumors came from? Because that's the current race motor. A motor that has restrictions. It's a de-stroked ls7 block I believe, with probably nothing else close to stock. If it could have been a balanced 5.8, that's probably what they would have chose.
Not only that, but ls7 and ls3 vettes return almost identical mpg. Displacement and hp is easily counter balanced by taller gearing in 6th(or 7th), it just happens they are identically geared. I mean, trying to be apples to apples here, I think I'm being on the safe side saying a 6.2 with direct injection would return 28mpg highway. An improvement, so why shrink if they don't have to?
Not only that, but ls7 and ls3 vettes return almost identical mpg. Displacement and hp is easily counter balanced by taller gearing in 6th(or 7th), it just happens they are identically geared. I mean, trying to be apples to apples here, I think I'm being on the safe side saying a 6.2 with direct injection would return 28mpg highway. An improvement, so why shrink if they don't have to?
Melting Slicks
Joined: Aug 2005
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Thread Starter
Le Mans Master
Joined: Jan 2005
Posts: 8,226
Likes: 2
From: Lake Wylie SC
As far as the designation “LS7” is concerned I agree with you. However, to say there will never be another 427 is in my opinion more than just being a little presumptuous.
There is nothing wrong with the short block from the “LS7” and there's no reason to suspect that if GM does resurrect the 427 for the Corvette that it will not be the same short block used in the “LS7”.
It was the LS7 valve-train geometry that needed to be done away with, and with top end from the LS 9 matched with the LS7 bottom end that would work well, and at the same time produce the magic 427 number without having to tool up for newly designed parts
There is nothing wrong with the short block from the “LS7” and there's no reason to suspect that if GM does resurrect the 427 for the Corvette that it will not be the same short block used in the “LS7”.
It was the LS7 valve-train geometry that needed to be done away with, and with top end from the LS 9 matched with the LS7 bottom end that would work well, and at the same time produce the magic 427 number without having to tool up for newly designed parts
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Drifting
Joined: May 2012
Posts: 1,385
Likes: 3
From: Las Vegas NV
Until sales start to slip with the C7. Or maybe the last year of the C7 Chevy will announce this will be the last year the 427 will be offered.
Drifting
Joined: Oct 2006
Posts: 1,372
Likes: 311
From: Bristol, VT
It's ok to to dream... (but the Iran thing was a bit tongue-in-cheek)
You are right, the GT500 runs on 285s. To each his own, but that's not what I want.
The 5.5L is basically confirmed. GM is really no longer being pushed for 5.7L+ larger motors. The new 2014 GMC Yukon/Chevy Tahoe will also have a smaller V8 (probably the same 5.5L as the vette), if you need more evidence...
You are right, the GT500 runs on 285s. To each his own, but that's not what I want.
The 5.5L is basically confirmed. GM is really no longer being pushed for 5.7L+ larger motors. The new 2014 GMC Yukon/Chevy Tahoe will also have a smaller V8 (probably the same 5.5L as the vette), if you need more evidence...
Burning Brakes
Joined: Mar 2010
Posts: 839
Likes: 0
From: Manassas VA
When asked at this year's Corvettes at Carlisle event, GM reps said this was the last year for the 427 - if you want a new one, 2013 is it. I am keeping my '10 Z06.
Believe what you want, but I believe what they said. There are a number of good reasons why I believe them:
1. C7 debuts a new generation small block, which will at least have DI. Lot's of bucks needed to produce an LS7 version of the new gen, which GM, still extremely cash strapped (still $15 billion worth of our money in debt), will not be predisposed to do.
2. I think everyone knows that the near term future brings increased govt restrictions re emissions, CAFE requirements. They must downsize displacements while introducing new features such as DI to meet the new regs while keeping the base power at least equivalent to current LS3 specs plus a bit more for PR purposes.
3. Big power for the Z versions will be S/C and/or turboed, no more N/A big displacement motors except for some very limited production cars such as the new Viper. No more selling thousands and thousands of big engined models ala C6 Z06s.
Just IMHO of course, but consider the logic.
Believe what you want, but I believe what they said. There are a number of good reasons why I believe them:
1. C7 debuts a new generation small block, which will at least have DI. Lot's of bucks needed to produce an LS7 version of the new gen, which GM, still extremely cash strapped (still $15 billion worth of our money in debt), will not be predisposed to do.
2. I think everyone knows that the near term future brings increased govt restrictions re emissions, CAFE requirements. They must downsize displacements while introducing new features such as DI to meet the new regs while keeping the base power at least equivalent to current LS3 specs plus a bit more for PR purposes.
3. Big power for the Z versions will be S/C and/or turboed, no more N/A big displacement motors except for some very limited production cars such as the new Viper. No more selling thousands and thousands of big engined models ala C6 Z06s.
Just IMHO of course, but consider the logic.
Le Mans Master
Joined: Dec 2004
Posts: 5,759
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From: AZ
St. Jude Donor '06-'08-'10-'11-'12-'13 '14-'15-'16-'17-'18-'19
Well, as a former owner of an LS7/Z06, if the LS7 comes in the C7 as the base engine, I won't be buying one. To many issues starting to crop up in the LS7. Now, assuming the 5.5 or 5.1 is the base engine, then I would be interested.
Le Mans Master
Joined: Jul 2009
Posts: 9,526
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From: Los Angeles California