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Originally Posted by ratter
Valve springs on the T are a performance gain as they allow more boost to be run in the motor, if valve springs are allowed why not allow forged pistons, better rods, etc and still be classed as unopened.
It is quite a debate whether valve sping replacement on a LS1 is acceptable as being unopened, but the LS1 racing class rules allow it and the majority do it as it allows the motor to retain the factory performance because the standard springs are weak and start to bounce at revs after some use.
The T does not suffer this problem until boost pressures are increased, so it is not a reliability issue, it is a perfromance issue.
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Might be a stupid question but how exectly can you make a XR6T go harder without adding more boost?
When you add boost you need stronger valve springs..If your gunna be that anal with saying valve springs then there should be different classes for guys who changed diff gears or do work to the gearbox as thats a performance issue,not a reliability issue