Im in the garage now trying to change out these valve springs, I hooked up the proper fitting to hold the valve up with air (heads on car) and I hear it leaking from the oil pan area not the seat. I know these pistons will knock untill warm but surely its not gonna cause this thing to not hold air!!. Anyone else experience this prob. I'm kinda concerned bout taking off the keepers at this point. Feedback please!!!!! I really dont want to remove the heads but it looks like I'm might have to

 

Just make sure the piston is at TDC, the valve will not fall in. I've done several set of springs without removing the plugs. It is a bit trickier because the valve does fall further into the block, but it's very doable.

-Alex

 

tug up on the valve to get a good seal? just starting with the basics...