how do i know?

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Lue

G-Body Guru
Nov 29, 2007
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Los Angeles, california
when do you know if you need an ignition box, like an msd?
 
unless you're drag racing you don't need one. just use a vacuum advance hei distributor and you'll be fine.
 
HEI ignition is a pretty good ignition in stock form. With that engine you posted in your other thread you wont need a box. The only advantage it would give your engine is maybe a rev limiter if you bought one with a rev limiter. If your not high compression or running a drag race engine then I wouldnt worry about it.
 
High compression, boost or Nitrous. Anything that creates excessive cylinder pressure and can snuff out the flame front in a stock ignition.
 
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