Timing Marks and Timing

[edszuk]

Originally Posted by fleetsidelarry

edszuk, does your damper look like the V-8 one pictured above or is the pulley made right on the damper? reason I ask is that the manual for our trucks shows the 6 cyl timing mark to be just a small v-notch on the rim of the pulley. But your engine is 10 years newer so might be different.

My first thought, as mentioned earlier by steveb64, was that the damper has spun, which happens, especially if the engine ever backfired hard.

As you know, fuel and electrical issues can often mimic each other and you can't easily chase down both at the same time. To me it sounds like a carb problem but until the timing thing is resolved you won't know for sure.

If you have the type with the notch in the pulley, I can copy the picture from the manual and post it, just for your reference.

Larry, if you can post a picture that would be great. The pulley does have some sort of notch on the outer part of the pulley. This notch should line up with the timing marks when the engine is at TDC; right?

Can anyone recommend a manual for a 66 C-10. The PO tried to do some re-wiring and didn't do a good job. When i step on the brakes the dash light turn on.

[fleetsidelarry]

try this for the wiring, I'll try to do the damper picture right after lunch.

http://67-72chevytrucks.com/vboard/s...d.php?t=324713

[fleetsidelarry]

hope this works, my scanner didn't want to produce a decent picture:



all this mark amounts to is as if you took a triangular file and made a little notch about 3/64ths wide and deep on the pulley lip (in this picture it's the lip closest to the timing cover tab but yours may be different if the pulley sits closer to the cover, i.e. under the tab)

[Slow Build]

I'm getting ready to pull my dizzy and put an HEI unit in. I'm trying to figure out the timing. I have no timing tab on the front of the timing cover. It looks like the truck runs (not well) right now with the timing about 1 o-clock position on the damper. I'm thinking TDC is at somewhere around 12 o-clock position. I guess I'll just use that as a starting point with the new distributor. Does someone have a picture of the stock timing tab for a 283 about 1965 vintage? How about where I can find an aftermarket timing tab?

[Slow Build]

Originally Posted by Slow Build

It looks like the truck runs (not well) right now with the timing about 1 o-clock position on the damper.

I figured out why it was running worse than usual. Vacuum cap at carb.

Still have questions about the timing tab though.

[Rich 5150 69]

You can buy the Mrgasket bolt on timing tab, it uses two bolts on your timing cover then that will get you closer to your mark..
http://www.jegs.com/images/photos/7204597.gif

[Slow Build]

Originally Posted by Rich 5150 69

You can buy the Mrgasket bolt on timing tab

I got one like that without the adjustable part at Kragen. Had to return it because it wasn't close to the engine mark and actually covered the damper so it was about an inch to wide and about 2 " to short to reach my damper mark. Mr Gasket makes a few others but but most are made for a 8" damper. Maybe I'll just take a chance on one of those to at least give me some kind of mark to go by.