The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - setting timing in 68 c-10 with 250

jpert · 12-19-2010, 01:12 PM

I think that since a timing light uses the actual spark plug pulse to operate and the light shows #1 firing at 12 o'clock (crankshaft location) that is where the spark has occured. I am going to locate TDC compression on #1 with a dial indicator and compare with front cover timing tab. I don't think the problem is in the distributor. There is a reason this engine runs with initial timeing set to what appears to be 20 to 30. Also, don't replace the dapner until you are sure it has spun.

12-19-2010, 01:12 PM	#19
jpert Registered User Join Date: Oct 2008 Location: Bismarck North Dakota Posts: 56	Re: setting timing in 68 c-10 with 250 I think that since a timing light uses the actual spark plug pulse to operate and the light shows #1 firing at 12 o'clock (crankshaft location) that is where the spark has occured. I am going to locate TDC compression on #1 with a dial indicator and compare with front cover timing tab. I don't think the problem is in the distributor. There is a reason this engine runs with initial timeing set to what appears to be 20 to 30. Also, don't replace the dapner until you are sure it has spun.