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mike100 · 04-10-2013

It could be cylinder to cylinder airflow difference, especially at idle speeds. Perhaps the rear cylinders are a little hotter as well.

I don't see it as being a very big deal so long as your blm map is close enough to center to be able to allow adjustment. As I recall, the LT1 engine has calibrated vac leak holes to each intake port to allow fine tuning of individual cylinders rich/lean from some mechanical design issues that can't be overcome.

04-10-2013	#17
mike100 Join Date: Feb 2011 Location: San Marcos CA Posts: 1,786	Re: What say you, Graham? It could be cylinder to cylinder airflow difference, especially at idle speeds. Perhaps the rear cylinders are a little hotter as well. I don't see it as being a very big deal so long as your blm map is close enough to center to be able to allow adjustment. As I recall, the LT1 engine has calibrated vac leak holes to each intake port to allow fine tuning of individual cylinders rich/lean from some mechanical design issues that can't be overcome.