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Old 11-24-2010, 12:59 AM
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olds 403 timing marks

Timing just doesnt seem right on my olds 403. I found two different examples of the timing marks. I have found crank 12 cam 6 ( rotor pointing at cylinder #6)
crank 12 cam 6 rotor pointing at cylinder #1 (like chevy 350) So which is it? Also does piston have to be at TDC of compression or exhaust stroke? Intake is currently off so couldn't i just just spin it over until both valves fully close? Heres a link to a site forum where they decided the rotor pointed at #6: http://www.ls1lt1.com/forum/showthread.php?t=27823

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Old 11-24-2010, 09:15 AM
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Quote:
Originally Posted by dman0712
Timing just doesnt seem right on my olds 403. I found two different examples of the timing marks. I have found crank 12 cam 6 ( rotor pointing at cylinder #6)
crank 12 cam 6 rotor pointing at cylinder #1 (like chevy 350) So which is it? Also does piston have to be at TDC of compression or exhaust stroke? Intake is currently off so couldn't i just just spin it over until both valves fully close? Heres a link to a site forum where they decided the rotor pointed at #6: http://www.ls1lt1.com/forum/showthread.php?t=27823
TDC on compression stroke. being you have the intake off, you can watch the lifter on #1 cyl intake (second from the front drivers side) as you rotate the engine untill the lifter goes down in the lifter bore and watch for the timing mark on the balancer as it moves towards the 0* mark on the timing tab. That will be TDC compression stroke #1 cyl.
This is where people make mistakes as the timing mark comes up to 0* twice
being the crank turns twice to every turn of the cam. Just turning the crank till the mark on the balancer comes up to 0* can put your engine on TDC exhaust stroke which will be 180* off if you put the rotor on #1 tower That's why they call it a 4 stroke engine.
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