timing question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

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.

hugger6933 · 09-20-2015, 06:10 PM

To set your basic timing ,yes.

sgt1022 · 09-20-2015, 06:36 PM

Gm's paperwork indicates that "this engine is designed to run on mechanical advance. The initial 10 degrees will produce 32 degrees total advance at WOT

geezer#99 · 09-20-2015, 08:55 PM

It's simply the bean counters in the warranty department.
They don't want you to put too much timing into the motor and hurt it and cause a warranty problem.

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.

09-20-2015, 06:10 PM	#2
hugger6933 Registered User Join Date: Oct 2008 Location: Marianna Arkansas Posts: 7,257	Re: timing question To set your basic timing ,yes.

09-20-2015, 06:36 PM	#3
sgt1022 Registered User Join Date: Oct 2013 Location: Palmetto, FL Posts: 107	Re: timing question Gm's paperwork indicates that "this engine is designed to run on mechanical advance. The initial 10 degrees will produce 32 degrees total advance at WOT

09-20-2015, 08:55 PM	#4
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,516	Re: timing question It's simply the bean counters in the warranty department. They don't want you to put too much timing into the motor and hurt it and cause a warranty problem.



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