On the SOHC 1.6 there are timing marks on the sprocket and rocker cover and on the block on the exhaust side about level with the top of the manifold.. I don't know if this helps. I hope so.
A stretched timing chain on a DOHC engine will cause a retarded intake camshaft timing and a slightly retarded or normal exhaust camshaft timing. The intake cam will take most of the stretch, leaving the exhaust cam mostly normal. The results of a retarded intake camshaft will be improved fuel economy due to less air-fuel drawn in during the intake stroke. Also, IF the exhaust camshaft is retarded from excessive timing chain stretch the result will be a lower NOX emissions due to exhaust gas being drawn in during the intake stroke, lowering the overall combustion chamber temperature.
If you want a stocker,you could use cast iron heads with 1.94 intake/1.60 exhaust valves.For your camshaft,you could use 423"intake/446"exhaust...Nothing special.If you want a little more performance,something that will turn heads,a weekend racer,or to seek and destroy rice burners,step up to cast iron or aluminum 2.02 intake/1.60 exhaust heads.For your camshaft,you could use a 498"intake/498"exhaust rough idle roller camshaft,with roller lifters.For race/competition,you could use ported and polished aluminum heads with 2.08 intake/1.60 exhaust.For your camshaft,you could use a roller 544"intake/567" exhaust with roller lifters.You could go either way YOU want.Just trying to ballpark it for you.
The crankshaft is turned by the pistons going up and down. The cam shaft is driven by the timing belt or chain that is turned by the crank shaft. The camshaft on a four cycle engine turns 2 to 1 crankshaft revolution. The cams on the camshaft operate the intake and exhaust valves. intake valve on one revolution and exhaust on the next.
The exhaust lifters will line up with the exhaust manifolds,Remove the valve cover if your working on a V8 and the valve that lines up with the exhaust port will be the exhaust valve,If it is a Chevy V8 they will be from standing in front of the car exhaust,intake,intake,exhaust,exhaust,intake,intake,exhaust.
Imagine a plane in space (like your workbench tabletop) and rotate the camshaft about its center axis such that the cam lobes become tangent with or "just barely touch" that plane. Each time the lobe is tangent it is opening a valve. The order in which those valves open is the order in which the cylinders fire. This is true whether you're looking at an intake cam or an exhaust cam. The cylinders all fire in the same order that they're filled with intake charge; they also fire in the same order that they are evacuated of their exhaust gasses. If you have a single cam that controls both intake and exhaust valves, this method requires that you know which lobes open the intake valves and which open the exhaust valves, and only pay attention to one set.
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