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On a 350 Chevy timing chain set why do some people say dots should be lined up cam at 6 o'clock crank at 12 o'clock and some say they should both be at 12 o'clock?
Wiki User
∙ 12y ago
You can line them up either way one way #6 is top center cam is at 6 oclock 12oclock # 1 is top center if you put the marks together your probally gonna get your distributor in 180 off
Trust me here. if you put the crank at 12 o clock witch is correct (key-way stright up) and you put the cam gear at 12o'clock witch is wrong it will not even try to start and you will be taking it back apart I promise. the reason is the #1 intake and exhaust lobes on the cam will be in a different place so when the #1 piston is at TDC the cam lobes for #1 cylinder or in a different position so #1 cylinder won't fire because cam and crank are not in time with each other. IF the key way in the crank is stright up then the gear on crank (dot) will be stright up then turn cam gear were the dot is at 6 0'clock that makes both dots stright over top of each other that will be correct. put engine back toghter it will run .
it has always been dot to dot but do not trust the dots. you need to put a degree wheel on the cam for the most accurate timing
WARNING: When the key way on the crank is straight up (12 o'clock) the crank gear timing mark is NOT at the same position (12 o'clock) on any SBC gear set I have seen, making the above instructions meaningless.
RESPONSE TO WARNING: what we have here is a failure to listen or someone only telling you half the story. when you install the cam and crank gears you line them up dot to dot. this gets you the closest to the manufacturer's specs without a degree wheel. once you have the gears and the chain in place, you rotate the engine until both dots are straight up. get a buddy to hold his finger on the number one spark plug hole with the plug removed, rotate the crank, when he gets air escaping past his finger, rotate the dots so that they are at 12 o'clock. this should be tdc for number one. adjust your distributor accordingly. once you get the motor to start up you then can put a timing light to it and adjust your timing more specifically.
WARNING 2: Not all timing chain sets are set up the same! Many after market sets, and most all racing sets have several keyways. You must bring engine to TDC for #1 cylinder (both valves closed and #1 piston at top) before taking the timing set off to make sure you have the right positioning on both cam and crank.
Wiki User
∙ 12y ago
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