I am either going to be useing a mallory or a msd distvac advanced dist, I was wondering ho do I achieve the total timing number? do I want the vac advanced hooked up how much do I want and by what rpm? the motor is a 350. what is mec advance and what is vac advance? how do they all work together to get the final 36 to 40 total? how do you set each?thanks

 

This is the reason I have had a subscription for years to Chevy Hi-performance magazine. Arguably the most helpful magazine in print. This should answer all your questions.

www.chevyhiperformance.com/howto/97438

Goes hand in hand with this one.
http://www.chevyhiperformance.com/ho...673/index.html

Use it with the search function for all your resource needs.

Dave

 

So if i set the timing to 10 at idle with the vac dissconnected, And say the dist has 20 built in to it, I would then bring it up to 3,000 rpm with the vac still distconnected and I should have thirty at this point? If I would want 38 I would have to set the base at 18? Do i want to check it with the vac hooked up? at all?