2v Valve Replacement DIY?

It’s the same as changing the valves on any engine but getting the heads off can be quite a challenge. Do some research on this forum, watch some YouTube videos (replacing engine valves) and find someone nearby to help/teach you. I have valves for £10 and viton stem seals for £1 plus shipping and you will probably need to re-line the guides (don’t replace them as the guide holes are not concentric with the seats so new guides will sink the valves into the seats once cut/ground.) Many engine shops will have the K-line 8mm guide lining kit.

 

Remove engine from car,
Remove heads from engine,
Send heads out for a valve job, and pay for the valve replacement
Install heads back on engine,
Install engine back in the car.

Unless you own a complete machine shop, a valve job complete with grinding and lapping valves as well as cutting the seats, is entirely out of your DIY realm.

 

If you send the heads out make sure they can either re-line the guides or fit guides with undersized IDs and index cut the guides to match the seats (not vice versa which they will otherwise do.) Most will fit std new guides and cut the seats to match which will sink the valves into the heads.

I found removing the engine and then the heads far more difficult than cutting seats. For my 308 I didn’t actually need to cut the seats as the re-lining kept the valves concentric with the seat— just lapped them in after some mild porting and plugging the air injector ports.

 

Here's a thread of when I did it, with pics:

https://www.ferrarichat.com/forum/threads/observations-on-a-gt4-engine-pull.458208/