Lets see them :cheers:

 

C5-R block is not going to be any better of a performer than a bored LSx block.

Just stronger.

 

oh, I thought they made a little more power and could rev higher...

 

TTT :rolleyes:

 

The C5-R block is simply a 4.120 Bore LSx based motor with siamesed liners and stronger A356 Aluminum casting with heat treatment.

When a LS1/LS6 block is bored the liners are reamed out and new larger liners are put in place. If 4.120 liners are used. Then it has the exact same dimensions as a C5-R block. But sometimes the liners can be prone to leaking. Most of the major shops have totally worked this problem out. Then there is the option of using the Darton Sleeves as well for super durability. Most go the route of boring a LSx motor, instead of dropping 6 grand on a C5R block.

The C5R block is great for durability and no leaking issues if you have the coin.

What makes the C5R engine a better option for power in racing is that the Heads are different, and the intake must be custom fabricated. The heads are very expensive and require extensive porting work to get them where they need to be for performance. But you have a lot more to work with than a LS1/LS6 head can provide. Then there is the price of custom fabbing an intake for the C5R heads. The C5R heads will bolt right up to any LSx based block.

So there is a difference if someone says they have a C5R engine, and a C5R block. To say a C5R engine would require the C5R heads as well.




[Modified by kewlbrz, 4:47 PM 7/22/2003]