Posted by David from 209.209.34.242 (?) on Wednesday, April 10, 2002 at 3:37PM :
In Reply to: Vacuum advance question on 251 posted by Covino Brothers from 159.105.102.7 (citrix2.doc.state.vt.us) on Tuesday, April 09, 2002 at 7:46AM :
Vacuum advance for the distributor normally comes from the intake manifold to reflect the vacuum of the engine. The vacuum of the engine determines the advance of the distributor. Do not hook it up to any line that uses a vacuum pump as it will not work properly.