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Author Topic: maybe i can get  (Read 2694 times)
JohnZ
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« Reply #15 on: October 16, 2013, 09:47:50 AM »

So now what makes a small block different than a big block these days? I thought it used to be dictated by CID size (with the 400 CID small block aside).

Mike

What differentiates the two is bore center spacing - the LS engines are 4.4", which has been small-block bore spacing since 1955; big-block bore center spacing is 4.84".
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'69 Z/28
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« Reply #16 on: October 16, 2013, 10:33:37 AM »

What JohnZ said...Smiley ...  and of course, that larger bore spacing for the old big blocks, also made for a *larger physical size* of the engines, which precipitated the terminology of 'BIG block'...  Smiley

Related question:  Was the 'old' 348/409' (1958-1964) series engines also on a 4.84" bore spacing?   If not, does anyone know what it was?
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
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lakeholme
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« Reply #17 on: October 16, 2013, 01:52:02 PM »

Quote from Chevrolet.com:
From 1929 and 1955, Chevrolet only offered six-cylinder engines. To address the burgeoning performance market, chief engineer Ed Cole set out to design a Chevrolet V-8 that was powerful, lightweight and affordable. His solution was elegantly simple: a compact, efficient 90-degree V-8 engine, featuring overhead valves, pushrod valvetrain, and 4.4-inch on-center bore spacing. The Chevrolet Big Block follows the same formula, with the exception of a wider 4.8 inch bore spacing.

Look HERE for the rest of the article.

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Phillip
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« Reply #18 on: October 16, 2013, 02:36:09 PM »

 I just checked out the specs for the new LS7 (427) and older 400 CID motor. I see the new LS7 is stroked compared to the older 400.  Between the two blocks If the bores (4.125") are the same as well as the centerlines to call it a small block does the LS7 have Siamese cylinders?

Thanks,
Mike
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JohnZ
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« Reply #19 on: October 17, 2013, 11:23:17 AM »

I just checked out the specs for the new LS7 (427) and older 400 CID motor. I see the new LS7 is stroked compared to the older 400.  Between the two blocks If the bores (4.125") are the same as well as the centerlines to call it a small block does the LS7 have Siamese cylinders?



Thanks,
Mike

Yes, it does.
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« Reply #20 on: October 17, 2013, 11:37:46 AM »

Although I've never worked with an LS engine, I believe ALL the LS engines, from LS1 thru LS? are siamesed, but since these engine blocks are aluminum, I'm suspecting that due to the better heat transfer characteristics of Al vs Fe, that the siamesed cylinders are not a thermal problem as they could be with the old 400 block?
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
68camaroz28
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« Reply #21 on: October 19, 2013, 08:47:07 AM »

Those LS7 motors are incredible and pull from start to finish. And with the brakes, suspension and light weight I'd love to have one.
Watch this and see what you think....
http://www.autoweek.com/article/20131015/CARNEWS/131019880?utm_source=DailyDrive20131015&utm_medium=enewsletter&utm_term=article3&utm_content=20131015-2014-Chevrolet-Camaro-Z28-laps-N-percentFCrburgring-in-7-minutes%2c-37.4-seconds&utm_campaign=awdailydrive
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Chick
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sdkar
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« Reply #22 on: October 19, 2013, 02:39:48 PM »

Okay, so which is the faster car?  According to what I have read...the Z28 is has a biggern engine, is faster and is more expensive than the ZL1...The world no longer makes sense.

http://www.autoguide.com/auto-news/2013/03/2014-chevrolet-camaro-z28-faster-than-zl1.html

http://wot.motortrend.com/totd-2014-chevrolet-camaro-z28-or-zl1-which-would-you-pick-417027.html#axzz2iCKYSb00

I suppose the Z28 is a stripped down purely track car, whereas the ZL1 is an all out fast street/strip/touring car?  Am I wrong.

And for the record, please tell me the renderings for the 2016 prototype Camaro is not true....ewwwwww.

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william1
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« Reply #23 on: October 22, 2013, 11:58:37 AM »

my dealer buddy has instructions to order mine as soon as the order process opens ,,,, w/ac sorry guys
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BULLITT65
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« Reply #24 on: October 22, 2013, 12:03:43 PM »

 if you can bare it let us know the $$$$ price   $$$. haven't seen it anywhere Huh

Also what color are you going to get?
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1969 garnet red Z/28 46k mile unrestored X77
Looking for 3192477 (front) spiral shocks 3192851 (rear) please
Looking for an original LOF soft ray windshield
Looking for original Delco side post negative battery cable part # 6297651AV
BULLITT65
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« Reply #25 on: November 25, 2013, 04:25:53 AM »

I just watched a video from Jay lenos garage, int he video the GM rep says they are going to limit production to 1500 units per year. But when asked about price he just says north of the ZL-1. So if a ZL-1 base price is around 56k, the Z/28 may be around 60 to 62k? I am still hunting for a definitive price on this machine.
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1969 garnet red Z/28 46k mile unrestored X77
Looking for 3192477 (front) spiral shocks 3192851 (rear) please
Looking for an original LOF soft ray windshield
Looking for original Delco side post negative battery cable part # 6297651AV
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