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sgt1022 · 09-20-2015, 05:43 PM

I have a GM 290hp/350 with HEI. in the installation and break in procedures GM says to disconnect and run the engine without the vacuum advance. I've never heard of this.

09-20-2015, 05:43 PM	#1
sgt1022 Registered User Join Date: Oct 2013 Location: Palmetto, FL Posts: 107	timing question I have a GM 290hp/350 with HEI. in the installation and break in procedures GM says to disconnect and run the engine without the vacuum advance. I've never heard of this.