I know this sounds lame, but I can't tell you who did the ECU right now. I've got a contract with a magazine. My truck and it's mods are going to be featured in a series of articles, and they're a bit funny about me giving away too much info.
I can correct something I wrote before. The 4200's flywheel has 161 teeth not 160 as I noted before. The Vortec I-5 3500 flywheel is made of cast iron and wont machine easily or inexpensivly. So I sent my specs to an aftermarket manufacturer and they're making me a steel one. They'll stock it with a part number. They'll also have it available in aluminum for you racers.
I'll post more details as soon as I can.
Thanks,
