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Old 07-15-2013, 04:09 PM
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How do I find TDC BBC

Hey guys, I have been looking around to find the answer but am getting differing answers, so I ask you all. I am working on my BBC 454 and have it pulled apart some and need to find TDC. I do not trust the timing marks on the balancer. I have the valve covers off as well as the intake is off. What is the best way to find TDC? Thanks

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Old 07-15-2013, 04:26 PM
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The info here should help. If not, ask again.
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Old 07-15-2013, 04:55 PM
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Having just done this myself, I have a couple of things to add.

1.) Remove all of the spark plugs and rocker arms, so you're not fighting compression and valve-springs.

2.) Assuming that you are not removing the heads, and that you're using the spark-plug style piston stop ...

it goes in at a very slight angle ... almost horizontal, and had to be threaded in all of the way. This also helps to make the piston stop a little more rigid which will help with the accuracy.

3.) Use a really long-handled ratchet (I ended up using my torque wrench) to give you lots of leverage. This will help to roll the engine over smoothly.

4.) If you're leaving the balancer on, I'd suggest using a crankshaft rotation tool, rather than risking any damage to the crank bolt or stripping threads.

5.) If you're removing the balancer and using a degree wheel, they make crankshaft sockets that mount directly to the snout of the crank. I used a Proform #67492 ... but would try the Comp #4797 instead, as it is made of steel, rather than Chinesium. I wrecked it on first use.
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