valve spring change with heads on the car?

[Fostang]

Here is what I did on two engines. Bend a screw driver at about a 45 degree angle and stick it in the plug hole a then slowly turn the engine crank with a socket and ratchet from the crank bolt then when the piston starts to reach tdc you'll feel the it start to hold the screw driver in place. Make your it barely touches the screw just enough to hold it so it doesn't scratch anything. Sometimes you don't hit mark the first time so before you take the locks off when taking out the springs make sure it doesn't start to fall in.

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67' Fastback-Mean Temper
67' Coupe Under Construction
70' Torino Cruiser
84' Svo Original