[Lynn]

I have seen estimates of approx 10% of the Z/28's with ducted hood. Of the 10,000 hoods, all the Z11 and Z10 cars got it. I believe there were less than 4000 of those combined. Pretty sure all the 200 Yenkos got it. Also all the other COPO cars and the 69 ZL1's. So, now you are down to like 5000 spread across SS and Z/28. Even if NO SS cars got it (but of course, some did) that only leaves 5000 for the 20,000 Z's (of course there are 40,000 69 Z/28's for sale today). So... by extrapolation, somewhere between 10% and 20% max, right?