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gator2511 · 05-17-2007, 09:51 PM

I just put a new GMPP HEI dizzy in my truck last week. I am getting too much vacuum advance with it hooked up to manifold vacuum. This Sat. I'll put the adjustable vac can on it and adjust it to about 20 Deg. advance hooked to full manifold vac. Initial will be at 8 deg btc. Then I'll have to play with the springs on the weights to get about 36 deg. of advance total. My truck likes to run with a lot of advance at idle so I give it all I can without pinging and it runs a LOT better! Do any of you guys use bushings on the weights to control or limit the mechanical advance? I've never seen them but someone told me they were available. That might be easier than the springs.

05-17-2007, 09:51 PM	#29
gator2511 Registered User Join Date: Mar 2005 Location: tampa florida Posts: 776	Re: vacumm advance question I just put a new GMPP HEI dizzy in my truck last week. I am getting too much vacuum advance with it hooked up to manifold vacuum. This Sat. I'll put the adjustable vac can on it and adjust it to about 20 Deg. advance hooked to full manifold vac. Initial will be at 8 deg btc. Then I'll have to play with the springs on the weights to get about 36 deg. of advance total. My truck likes to run with a lot of advance at idle so I give it all I can without pinging and it runs a LOT better! Do any of you guys use bushings on the weights to control or limit the mechanical advance? I've never seen them but someone told me they were available. That might be easier than the springs.