One cylinder at a time. Rotate cylinder until piston is before top center and feed a long piece of rope into the spark plug hole, then rotate it more toward top center until it won't move, replace springs.
I went to O’reilly’s and borrowed their spring puller. Replaced all my springs while on the car. Took me a couple hours but it’s done. Made my first u tube video so don’t judge, but it shows the process. Right, wrong, or indifferent. Check it out.
