James, yes, whatever cylinder the offending (low air flow) carb/throat get moved to dosn't fire, and when you replace with a good carby, runs normally. At first i thought was a compression problem with cylinder one, as comp was a little bit lower, but now that i've done around 600k's, (with 350 holley) rings must have bedded in better as comp is consistant across all 6 cylinders. So i will concentrate on offending carby so see if i can see anaything obvious. I might even try swapping jets/tubes, butterflies ect from one of the other 2 carbs, as i think just a process of elimination now. I tried adjusting idle mixture, make a slight difference to how engine ran, but not to airflow reading. Idle mixture screws on other 5 throats were more definitive in response to adjustment. So just to clarify, the barrel/throat that only flows 2ish on air flow is the problem, no matter what location it is mounted to cylinders/engine, cheers Paul
Edited by lctriples, 17 January 2022 - 11:08 AM.