Smog Era 350 Vortec build.

[novadude]

My initial is 12 degrees, with a 30 degree total. Vortec heads aren't supposed to need much more than that. I started out at 15/33, and it didn't ping there either. This is also a fuel economy build, I have the QJ leaned out as far as I can and not have a lean surge at cruise.

My ~9.5:1 CR 355 with vortecs and a relatively small cam also likes 13 deg initial with total at 33 deg (vacuum advance on ported). Also using a Q-jet with AFR around 15.3:1 at highway cruise speed. Delivers good MPG.

[rebelyell]

Dunno? but seems the OP keeps moving his own goalposts; maybe next it'll be a JohnRude 2-cycle?