Want an easy way aside pulling things off to check it?
I know there's the spark plug on compression. But wanting closer for the timing accuracy.
A forum for all the owners and enthusiasts of General Motors B-Bodies from 1965-1996, but dedicated to the owners of 1977-1979 Impalas and Caprices. Join up now!
BrokenBlazerDave wrote:I had to find TDC one time on an assembled engine. I used a piece of wire to get close to TDC. Then I took a spark plug and removed all the porcelain. I pressed a rounded end bolt into it and made my own piston stop. With the piston down the cylinder I threaded the stop in and rotated the engine both ways until it contacted the stop. At each stop I marked the balancer. Once I had both marks I measured to the middle and that should be TDC. This should take into consideration that the piston spends 10 to 15 degrees of crankshaft rotation at the top of the cylinder while the piston is changing direction. This should give you the most accurate TDC without a dial indicator.