Dennis,
You know I don't have a Tiger, but I am using carbon blocks.
And YES, thay have carbon fibers in them. That is why they are called COMPOSITE. I spoke with Peter Harken a few months ago and he explained that they had finally figured out how to mold products with long fibers in them. He specifically stated that you could burn off all of the plastic and end up with a pile of long carbon fibers.
My quote was from from the IHCA Tiger Class Rules website.
My comment was pointing out the fact that their rules don't agree with the boats they sell.
Which is class legal?
Whatever you buy from the dealer or whatever complies with the rules?
If someone without carbon blocks protests you at the Mega Event, can you PROVE you bought the boat with them on it and therefore ARE class legal?
What if you replace just ONE of your old blocks with a carbon, are you still class legal?
Remember, this is the bunch of idiots who wouldn't let us splice smaller lines and now we can't even use the tapered lines.
It's your boat, run what you want.