Is there an easy way to replace frost plugs. Need to do two in 75DL1400 and &72GSR. Do I need to take the engine out. I have undone the mounts and lifted the motor but not enough room to tap plugs in. Ideas and suggestions thanks.

I have done the ones in the valve area of an EA81 while it was still in the car. A little annoying, but doable. But, then, the EA81 has a little more room between its rails.

 

Not really that big of a deal to pull the engine all the way out, or even just forward enough to tilt each side for access.

If I see a mate of my dads, I will ask him. He worked on Subaru 1400s when new I think in Invers.