The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Seems like I have to keep advancing my timing

CSHADES · 08-08-2016, 04:32 PM

The timing chain is the most common cause of the timing changing like you are describing. That is why I said you should check the vacuum reading at a manifold vacuum port not a ported vacuum port. if the vacuum is dropping from16-18 inches that usually means the cam timing is changing. Ignition timing usually doesn't change much over the life of the engine but what you have going is interesting. I see it is supposed to be a new engine, what is the story on it?

08-08-2016, 04:32 PM	#8
CSHADES Registered User Join Date: Nov 2015 Location: portage wi Posts: 509	Re: Seems like I have to keep advancing my timing The timing chain is the most common cause of the timing changing like you are describing. That is why I said you should check the vacuum reading at a manifold vacuum port not a ported vacuum port. if the vacuum is dropping from16-18 inches that usually means the cam timing is changing. Ignition timing usually doesn't change much over the life of the engine but what you have going is interesting. I see it is supposed to be a new engine, what is the story on it?