I just finally read the GM PROM from my buddy's '87 350 TBI/700R4 Suburban. acsu0024.bin is the GM bin subhtec.bin is the Hypertech bin that he's currently running. http://24.4.36.39/ron/dub Do NOT copy that H-tech bin. You can use it for comparison purposes only... ~~~~~ Ron Gregory '91 Syclone #1452 rgregory at iname.com Garland, TX