I've been checking around, but can't seem to get a solid answer for my question. I have an ls with pr3 pistons and delta 272 cams. Head has been milled .030. I recently degreed the cams. I ended up with +2.5 on the exhaust cam, and -4 on the intake cam. Before taking it to get street tuned (car will never see the dyno), I decided to double check my ignition timing. I did everything as far as the basics are concerned. Jumped the service check connector, operating temp, even unplugged the iacv since the idle was set a little higher to keep the engine from stalling when the cams were first installed. With the head being milled, and the cam @ -4 degrees, I can't get enough adjustment out f the distributor. To get it to run without ******* from a stop, it's all the way advanced, and it looks to be about 15 degrees. So here are my questions:

Is this common?

Is my new base ignition timing actually 24 degrees for the amount of intake retard? (2 degrees ign for every 1 on the cam gear)

Do I leave the distributor all the way advanced where it is now, and have my tuner add the extra (approx) 9 degrees across the board to get from 15 to 24?

Other cams have not had this much adjustment before, so I've never encountered this. Thank you!

 

if distributer is maxed out with adjustment than add or subtract x amount of total timing in your timing maps to so that you true timing for your tune is on point. make a note of what the timing change was so that future changes can be reversed if distributer adjustment can corrected.

 

You set the base timing at 16 degrees, no other calculations. You are only 1 degree retarded from where it should be.

 

if you are using a remanufactured dizzy thats what you get most of the time. they are not calibrated properly and max out with stock settings giving you no play.

i had exact same issue when dynoed my car first time