I hooked up an AEM wideband setup in order to monitor/tune my engine. 476 BBC, 9-1, aluminum oval port heads, dual plane intake, 850 quick fuel marine, Berkeley jg A- impeller fresh from MPD, 5400rpm wide open.
at around 3400-3600 I'm bouncing between 12.1-12.6 on the meter, wide open it was between 13.3-13.6. Seems like I can go leaner at cruising rpm, wide open seems ball park. Is it normally for the ratio to bounce around like that? It's completely erratic, almost hard to catch the reading before it bounces a little higher or lower. But engine runs damn good andcruises smooth as butter. Thanks!