I have also heard that to save money, you can heat it and spin it on the flywheel about 30 degrees.
If you look, there should be three different places on the ring that are worn.
That is because of a compression stroke on one of the cylinders coming up, so the engine generally stops rotating in those three spots.

Don

1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
1946 2-Ton grain truck
1946 3/4-ton pickup,
1953 1-ton pickup
1957 1-ton flatbed dually,
1954 Pontiac Straight Eight
Of all the things I've lost in my life, I miss my mind the most!