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

LandonL · 08-20-2010, 08:49 PM

Only way to know for sure (as far as I know) is to take the timing cover off and look at the two gears. There's two distinct marks and when they align that's the compression stroke. It could've run with it opposite, not sure if it's possible. If you just stuck your hand on the hole it could've been the exhaust stroke. Since you took the distributor out that would've been the only other way to tell if it was the exhaust stroke or compression by telling which way the rotor was pointed.

Also, question to anyone reading this would the harmonic balancer mark point to the 0 on the exhaust stroke? If so, this is most likely the problem

08-20-2010, 08:49 PM	#4
LandonL Registered User Join Date: Nov 2009 Location: Georgia Posts: 440	Re: setting timing in 68 c-10 with 250 Only way to know for sure (as far as I know) is to take the timing cover off and look at the two gears. There's two distinct marks and when they align that's the compression stroke. It could've run with it opposite, not sure if it's possible. If you just stuck your hand on the hole it could've been the exhaust stroke. Since you took the distributor out that would've been the only other way to tell if it was the exhaust stroke or compression by telling which way the rotor was pointed. Also, question to anyone reading this would the harmonic balancer mark point to the 0 on the exhaust stroke? If so, this is most likely the problem __________________ ---\| 1967 GMC Stepside \|-- 250 L6 .030 over ---\| 1985 Porsche 944/1 \|--- Build Thread: '67 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=378640 Last edited by LandonL; 08-20-2010 at 08:52 PM.