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They are just little dots on the outer edge of the gears that you line up when assembling it. The crank gear timing mark on small and big block Chevy's is a couple teeth away from the key-way slot, that's the mark you line up with the dot on the cam gear.

If the chain jumped then you'll have to turn the cam until the mark on the cam gear is pointing straight down and turn the crank so the mark on the crank gear is pointing straight up at the mark on the cam gear before you put the chain on and tighten the bolts. The crank key-way will be at about 2 O'clock when the timing mark is pointing straight up. If you can't turn the cam to line up the marks then thread a couple 2 inch long 5/16 X 18 coarse thread bolts into two of the three cam gear bolt holes and use a screw driver between them to lever it around until the mark on the upper cam gear is pointing straight down at the center of the crankshaft -- do not force it, you'll feel the pressure of the valve springs as you turn it but should not feel anything else, it shouldn't lock up and if it does don't force it. With a stock camshaft you shouldn't have a problem but if an aftermarket cam with more lift was ever installed then the valves should be backed off before turning it over like this as the valves could hit pistons depending on the position of the crank, although if the timing chain jumped on an engine with a big cam then the damage has probably already been done anyway. I'm not going to go into this aspect any further as it doesn't really apply to a bone stock 350 Chevy, a word to the wise is sufficient and anyone who takes a wrench in their hand is ultimately responsible for what they do with it.

Keep that in mind if you use an aftermarket double roller timing chain with three key-way slots in the crank gear that you do NOT line up the mark in line with the key-way with the mark on the cam gear or you'll be a couple teeth off. If you're using stock replacement parts then most likely it will only have one mark on the crank gear that's about 2 teeth away from the key slot and is the one you line up with the cam gear. Just looking at the gear you should be able to see what I'm talking about -- it's actually between two and three teeth away from the key-way slot.

If the old cam gear was aluminum with nylon coating on the teeth the mark on the upper cam gear will be a little arrow pointing inward, if you're replacing it forget the nylon gear and don't let anyone sell you one, get a steel or iron replacement upper gear or buy a timing chain set that comes with steel gears.

For more info consult a shop manual, but above ^^ is the basics to watch out for when you start buying replacement parts.

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โˆ™ 2010-03-21 07:42:22
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Q: Looking for camshaft and crankshaft timing mark locations on a 1978 Chevy 350 truck?
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