Hello.
I m having issues with setting the carb. I have 600 vacuum secondaries holley. Engine is 400 cid and the cam has 218/224 duration at 50 lift. With vacuum gauge i have about 12 inch of vacuum at 750 rpm idle. Timing is about 15 degrees at idle. I bought wideband for further tuning for cruise/wot etc. What i found is that the engine idles with best vacuum at 13,0 to 1 AFR ratio. It seems to be a bit rich and is smelly. Is it normal with this spec engine or is there any other reason why engine likes this rich idle?
I m having issues with setting the carb. I have 600 vacuum secondaries holley. Engine is 400 cid and the cam has 218/224 duration at 50 lift. With vacuum gauge i have about 12 inch of vacuum at 750 rpm idle. Timing is about 15 degrees at idle. I bought wideband for further tuning for cruise/wot etc. What i found is that the engine idles with best vacuum at 13,0 to 1 AFR ratio. It seems to be a bit rich and is smelly. Is it normal with this spec engine or is there any other reason why engine likes this rich idle?