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Can someone please point me to somewhere that explains the benefits/different times to use the different types of distributors of a 460.

IE. Vac Advance, Mech Advance, Points Ect.

I am running an MSD 6AL with Blaster 2 coil on a Mild Comp Cam 460 motor and trying to make a determination of the best Distributor to choose.

Main Goals reliabilty and low end torque.

Thank You,
Reggie
 

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Generally, vacume advance is needed (in addition to mechanical advance) when the engine will be operated under part throttle conditions. This is because the air/fuel will be less dense under part throttle and burn slower, requiring more advance to ignite at the right time.

If you're only running under full throttle, mechanical advance is all that's needed. No vacume under WOT, so vacume advance doesn't do anything. Mechanical advance still helps make starting easier and it'll run better around the pits, etc.

If you're only running under full throttle and it'll always be above ~3000 (like with a 4000 stall converter), you can lock out the advance and run a fixed amount of timing. Often a manual timing retard is installed to make starting easier.
 

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So what if you plan on running a large cam, high compression engine w/ nitrous on the street? Would it just not make as much power under part-throttle, would it get markedly worse fuel economy or what?

Are there any downsides to running a vacume advance unit in the above application when the same rig is used during the hi-po part of its life, i.e - sledpulling?

-Matt
 
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