I agree about the hoosiers. One braking mishap, a big flat spot, and a totally new tire wasted. When I first started, it was a set of hoosiers per weekend. Part of the problem is heat cycling. If you get one session on a new set and then put them in the basement for at least 48 hours, they will last 2-3 times as long. But thats still a very expensive, very short life.

Almost everything on the 280 is stronger.
I don't know about the 4.20 either. I think Eprod cars run a 4:34 or something like that.
Anything over a 3.90 and there go the stock valve springs.

We need to get more out of katman before he forgets about z-cars completely.

Tom