In late fall switched to Edelbrock aluminum heads from stock iron heads on 540. Will these lean the motor out much? Have all winter to worry about it. Thanks

Probably not much. The edelbrocks don't flow much better than the stock Iron rectangles. Still good to check though.

Ouch.... I wouldn't imagine either unless your did more than a heads swap. what kind of exhaust you have. If possible try and get an afr 02 over the winter. Best investment you'll ever make. Chambers same size as your old cast heads?

Chambers the same size. Running Lightning Headers. Dropped valve seat out of recond. iron heads.

I ran lightenings when they were 1050.00 a set new. Loved them. They sound extremely nasty. At time had a sound all of their own. Back to your jetting though I think you'll be fine. I strive for best possible jetting no matter what it takes. Black plugs and carboned up pistons is unexceptable.

I'm just curious why you thought that your jetting was spot on before?

When the motor was built ,it was dynode.