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Discussion Starter · #1 ·
i think that the guy that had my truck before already put on a adjustable vac. advance on the 400m.

how would i tell?

he put so much other stuff i would think that he would put that on to
 

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The adjustable vacuam advances had an allen head screw inside the vacuam hose opening.
 

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scrounger extrordinaire
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can adjustable vacuum advance be added to any motor? my 460 is using all the stuff that came with the 79 when i got it, we just put it on the 460. whats the advantage of it besides the adjustability factor? AXE
 

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The vacuam advance is used for " gas mileage " and you would adjust it if you get any knocking at a steady speed provided everything else is set right. You could also try adjusting it up if there is no knocking.
 
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