| quote | Originally posted by Patrick:
If your harmonic balancer hasn't spun, then the wide groove on the balancer is TDC for #1 and #4. Make sure you're on the compression stroke for #1. If your balancer has spun, then you'll need to use a plastic straw or something similar in the #1 spark plug hole to determine TDC. |
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SOme good points but just to clarify the straw method will determine if the piston is up on the compression or up for the exhaust stroke. TDC is only taken on the compression stroke. When spark plug holes were reachable we use to remove the plug put our thumb over the hole and crank the engine over with a remote starter switch. When we felt pressure building and pushing the thumb off we continued to turn the engine over until the timing mark lined up with the mark on the timing tab. Point is the only true way to find TDC with the engine fully assembled is with a compression gauge and then take Patrick's advice on the balancer. .
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