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Hey man i was looking at your 20b find thread.
I'm in the same boat picked up a 20b (pre alpha stamp #754) for 1k on craigslist lol
did you ever figure out if it was your ls1 coils that were bad? i'm about to run some LSx gen IV truck coils
The Radiator is AWR. At the time it was the same radiator that MazdaSpeed sold as the FC racing radiator... it is 4" thick and WAY overkill for 99% of peoples projects... It will be replaced with a more efficient 2 row radiator