von

Im have my timing advanced but after I streetported the engine during a rebuild I realized that the lower secondary port on the 6 port housing , when grinded lower its like advancing the timing or something. Anyways is this true and will I have to retard the timing to prevent detonation?

1FastT2

iTrader: (1)

No you will not have to retard the timing. The port timing and the ignition timing have nothing to do with each other in those terms.