Got a AEM UEGO Wideband oxygen sensor/gauge and do some "real world" tests on road with the 17059222. The APT screw on the pretty lean 77 jet/52 rod combo from the 1977 (17057204) was bottomed out(!) from factory with a 350cui/THM350 power team.
My guess was right that the APT with the slightly richer 71/40 combo worked great with APT bottomed out...AFR`s are about 15.5-16.5 at light part throttle and MPG is 18-19 now..not tweaked for max. power but i`m fine with it (daily driver with Super 95)Also a tad more timing adv. turned out a good idea,i`ve 8deg now but i think it will take even more.12-14 deg (no pinging!) runs good but i couldnt get the idle speed down enough to pass the emission test Test is showing 2% CO (3,5% allowed) @idle with idle mixture screws 2,5 turns out..
Maybe it helps somebody out, i`m going to do my body work now (rusted out rear body mounts, rear frame...)
Thanks everyone for your help here
My guess was right that the APT with the slightly richer 71/40 combo worked great with APT bottomed out...AFR`s are about 15.5-16.5 at light part throttle and MPG is 18-19 now..not tweaked for max. power but i`m fine with it (daily driver with Super 95)Also a tad more timing adv. turned out a good idea,i`ve 8deg now but i think it will take even more.12-14 deg (no pinging!) runs good but i couldnt get the idle speed down enough to pass the emission test Test is showing 2% CO (3,5% allowed) @idle with idle mixture screws 2,5 turns out..
Maybe it helps somebody out, i`m going to do my body work now (rusted out rear body mounts, rear frame...)
Thanks everyone for your help here
Last edited: