It took about 4 + years for mine. Then I just had it resized and now I suspect I will have a couple of years more. And I might resize it again. Not sure when it will be done for sure. I doubt that Tim wants to wait that long!
I had the back plate come loose in my multi boat on saturday. The back plate hit the piston and now it has sub induction. It runs ok at fuulll noise but wont idle. wonder why anyway the piston is us but the liner is ok. I have to look through my spares ( have them stashed away for a few years and see what i can offer you.)
2001 NR 21 engine. Also have parts for car LS 2000 NR and car 2000 Short. ALl used