[JSchmitz]

Originally Posted by TRADERMIKE 2012

This Engines Ignition was timed @ 6 degrees BTDC prior to recently returning the proven Cam timing to 113.5 from 109.5. Then we checked the Initial Ignition Timing and it moved to 10 degrees BTDC, without touching anything, especially the Distributor, why? We returned the Ignition Timing back to a factory setting of 6 degrees BTDC where it seems to work just fine for our purposes.

I am thinking that mathematically speaking 10 degrees - 6 degrees = 4 degrees that we moved the Cam timing that had the effect on the Initial Timing change?

The distributor is driven by the cam. Changing cam timing does change ignition timing.

Why are you so against recurving your distributor? Yours is way off in my opinion. You have too little initial, and too much total, advance. A proper distributor setup is essential to performance, cooling, mileage, etc.