On spark reference angles, I've found the following to be true SO FAR: On distributors it equals the initial timing On Hall Effect DIS (Crank+Cam) Sensor= 70d On reluctor DIS (just crank sensor)=60d The Holden v-8 uses a bosch "module" and the 60d The holden DIS v-6 is 70d. Any one find anything different???. Grumpy