What if the springs are allready install ?

 

You will need to build an attachment that will thread into the sparkplug hole on one end and hook up to your air compressor on the other end. Then you can fill the cylinder with air pressure. This will hold up the valve while you remove the heavy spring and install the light spring.

 

I just found my pushrods are too long. Gonna buy a pushrod lenght checker.

 

Don't forget to add the preload figure to the push rod length you come up with before youn order them.