Are you talking about the Z/28???
If so, they are 5.5 quarts to full. Most put in 5.75 to 6.0 though.
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Yes, 2000 Z28.
I thought it was 6 quarts from the book and even have seen on LS1TECH that most use between 6 and 6.5 (filter change) as the filter can hold up to 1/2 quart. That to me says 6 in the pan and roughly .5 in the filter = 6.5. 6 quarts brings it to the bottom of the fill line on my dip stick. I havenet had any issues with it. My GTO was the same way, it took about 1/2 quart more than what the book said.
Book calls for 5.5. With using the bigger filter 6 should fill it perfect