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savatreatabvr · 03-20-2012, 02:52 PM

The HEI vacuum advance on my mid 70's 454 went out so I plugged the manifold vacuum, advanced the timing and I'm driving it until I find the correct vacuum advance. It still doesn't drive right but it drives better. My question is, will it hurt the engine driving it this way?

03-20-2012, 02:52 PM	#1
savatreatabvr Registered User Join Date: Oct 2011 Location: phoenix, az Posts: 508	Driving Without HEI Vacuum Advance! The HEI vacuum advance on my mid 70's 454 went out so I plugged the manifold vacuum, advanced the timing and I'm driving it until I find the correct vacuum advance. It still doesn't drive right but it drives better. My question is, will it hurt the engine driving it this way?