What do you mean height change? Sorry im still learning. I got the 302 casting heads from a junk yard years ago. Just had them rebuilt at a machine shop that i e been using for years. When i called they said they checked the springs and the were good. But. Im going to check for coil binding on friday. I will measure the springs on the ild heads to see if they are a little taller. How do you measure lifter preload? Sorry Like i said im still learning
