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Tell tale signs it`s a C5R?

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Old 08-28-2007, 12:03 PM
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Arrow Tell tale signs it`s a C5R?

I know a guy with a C5 that is claiming that he has a C5r block. Well, I believe him, but it made me wonder, are there any tell tale signs of a difference between an LS1 block and the C5R? I posted this in this forum because I thought this would be the most likley place to find some one with the experiance with a C5R block
Old 08-28-2007, 01:08 PM
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More info on the car itself ?
Old 08-28-2007, 01:57 PM
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If it has a big oil tank in the engine compartment...... C5R blocks are dry sump.
Old 08-28-2007, 02:09 PM
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I have seen them wet sumped. If I know who built that car I might be able to tell you where to find out whats in it. Like which shop assembled it.


Originally Posted by 408z28
If it has a big oil tank in the engine compartment...... C5R blocks are dry sump.
Old 08-28-2007, 06:12 PM
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if it was a wet sump it would have to have an external oil pump. There is not a mail oil passage that runs down the side of the block on a C5R
Old 08-29-2007, 01:23 AM
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Originally Posted by GM Parts Direct
This is the same block that was used in the LeMans 24 hour endurance racing C5R Corvettes, and is intended for maximum effort competition engines. This block has the same production external dimensions and bosses, but the primary difference between this block and the Gen 3 production blocks is a siamesed water jacket, which allows engine builders to build engines with larger bore sizes. The delivered, pre hone, bore size is 4.117", and the maximum finished bore size recommended with this block is 4.160". Cylinder deck height is 9.240". This block uses a dry, pressed-in liner similar to other GM racing aluminum small blocks. Steel billet bearing caps are fitted to the block. This block features wet sump style oiling and is made from high strength A356 aluminum that utilizes a modified T7 heat treat. Production Gen 3 style cylinder heads may be used on this block; however, for maximum performance, P/N 12480090 Gen 3 racing cylinder heads should be used.
Some of you might want to know what your talking about before you post.
Old 08-29-2007, 10:19 AM
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Originally Posted by GIJosh
I know a guy with a C5 that is claiming that he has a C5r block. Well, I believe him, but it made me wonder, are there any tell tale signs of a difference between an LS1 block and the C5R? I posted this in this forum because I thought this would be the most likley place to find some one with the experiance with a C5R block
C5R blocks have blue anodized screw-in plugs in the sides of the block. Stock blocks don't.
Old 08-29-2007, 05:43 PM
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C-5R blocks are made from cast 100% pure unobtainium. Like Kriptonite they will set off foreign car alarms and airport explosive detectors. The give away is they tend to glow in the dark with a strange bluish light.
Old 08-29-2007, 06:00 PM
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Originally Posted by twospeed
C-5R blocks are made from cast 100% pure unobtainium. Like Kriptonite they will set off foreign car alarms and airport explosive detectors. The give away is they tend to glow in the dark with a strange bluish light.
WRONG!

They are 90% unobtainium and 10% cantaffordium. Do some research before you post.
Old 08-30-2007, 08:26 AM
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I stand corrected. Sometimes I jump before I look for a landing place. That's one of the reasons I earned the name: twospeed.
Old 08-30-2007, 12:12 PM
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So was it ever confirmed that the C5R doesn't have a main oil passage, thus necesitating the need for an external oil line...
Old 08-30-2007, 02:47 PM
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Originally Posted by gun5l1ng3r
So was it ever confirmed that the C5R doesn't have a main oil passage, thus necesitating the need for an external oil line...
The C5R block that I have worked on did not have the main oil passage that runs down the side of the block from the oil pump like the LS1, and to my knowledge none of them do. I'm not sure why the gmpartsdirect website would say it is wet sump oiling because i think they were designed with dry sump in mind.
Old 08-31-2007, 12:44 PM
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Why not just look at the casting number......

Keith
Old 08-31-2007, 12:50 PM
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That's the obvious answer for someone who dressed himself today
Old 08-31-2007, 01:03 PM
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Originally Posted by 408z28
If it has a big oil tank in the engine compartment...... C5R blocks are dry sump.
Not exactly true. You're thinking of the LS7. I have a C5R block in my '01 Z06 for 7 years. The bare C5R block is available from Chevy, or gmpartsdirect, and has been for years.
It's much more expensive than the LS7 block.
Old 08-31-2007, 01:26 PM
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i have a wet sump,as far as i can tell its the same as a standard ls1.the dry sump is optional,with a different oil line hook up.
Old 08-31-2007, 04:46 PM
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Originally Posted by ls1290
Why not just look at the casting number......

Keith
that would probably save some time.
Old 09-01-2007, 03:23 PM
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Hey guys,
In my tenure with MTI I built a couple of dozen C5R block 427's. Just to settle the issue, C5R blocks have the exact same oiling system as a production block. No external oiling line.
Old 09-03-2007, 06:05 PM
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Cool

Originally Posted by Awesomeperfmachine
Hey guys,
In my tenure with MTI I built a couple of dozen C5R block 427's. Just to settle the issue, C5R blocks have the exact same oiling system as a production block. No external oiling line.

yep-

if still unsure ask katech they should know better than most people-
Old 09-05-2007, 05:18 PM
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All LS1 blocks have that circle stamped on the lip where the heads mount. LS6 blocks do not however, but hey, i would go with the cast numbers as well.


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