There is a way but it requires a compressor. you run the piston to TDC so the valves are closed. There is a tool called an air hold which screws in in place of the spark plug then you pressurize the cylinder with the compressor to hold the valves closed. Then use a screw type spring compressor to remove the springs and replace the seals.

Keith/Bumble

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1971 Ford Torino
1999 Ford Mustang
1965 Galaxie 500 LTD 2 door fastback
1967 Sunbeam Alpine