Tell tale signs it`s a C5R?
08-28-2007, 12:03 PM
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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
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.
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.
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
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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. 
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.
They are 90% unobtainium and 10% cantaffordium. Do some research before you post.
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...
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.
It's much more expensive than the LS7 block.
that would probably save some time.
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.
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.
09-03-2007, 06:05 PM
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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.
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-
