remove both vac lines to time a 1980?

[grahamkissack]

I'm just fine tuning and will be rechecking my timing. Bentley isn't specific...do I remove both vac lines from the distributor before timing to Z1 at about 950 rpm with the engine warm?

Thanks, Graham

[dean]

Yes I believe you do remove both lines. But I think you want to set total advance at 4k rpm. Then you check the idle advance.
Dean

[john walker's workshop]

both hoses off, turn down idle to 950, set timing to spec, reattach hoses and reset idle speed.