I do have two questions.

Can you give details on your spring compressor?

I assume the piston is raised to TDC and the crankshaft held there so a valve cannot fall into the cylinder? As a practical matter, if you left the pistons down and used 75 lbs or so of pressure, what are the chances you would drop a valve into the cylinder?

Thanks

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2012 E350
2006 Callaway SC560