The good: the ZL1 is back on the road and running relatively strong. Oil consumption is way down, and it's moving a lot of air due to the better heads, ported blower, and bigger crank pulley.
The bad: I saw some stuff in the motor when the heads came off that made me think it's not going to last forever. Specifically, the bores have a bit of scuffing; not surprising considering its history of road course flogging, but concerning in that it doesn't suggest a long and happy future at even higher power levels. So I've dragged my spare LSA block from the pole barn and started collecting parts for a build. I picked up an offset-ground L8T crank (from the current 6.6L truck engine) from Mast:
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It's proven to be tough in forced induction applications, it takes the same 8-bolt flywheel as the LSA, and the stroke is a bit friendlier than the more typical 4" aftermarket crank in stock blocks. Wiseco makes pistons that fit; they're on order and expected to arrive around Halloween, and will provide a comp ratio around 10.2:1 depending upon the heads. Got some Boostline rods to connect the two. The block just needs to get punched out 0.005", and hopefully the short block will come together on a dark winter night. I haven't yet decided if I'll run the CNC LS9 heads that are currently on the car, or a set of WCCH LSA heads that are sitting on a shelf; they flow similarly but have a few cc difference in chamber volume.
The plan is to top this off with a Kong TVS2650 blower. The little 1.9L stock unit has a bit more left to offer, but won't be able to fully utilize the potential of the new bottom end.
Someone in the thread mentioned a "trunk tank" (ice water reservoir in the trunk), and I think that's in the future. I want to set it up so that I'm pumping glycol thru the heat exchangers up front and have a four-way valve to bypass the tank when not in use, so that's going to take a bit more work than the typical install.