4 replies to this topic

[nomininolife]

Hi Everyone

I have 28mm valves in a cylinder head but I want to put standard size 29mm valves in. Is it just a case of re-cutting the seats or will it mean the seats need milling first?


Thanks


David

[Guess-Works.com]

You only need to re-cut the seat, but you need valve seat cutters to do it.... so unless you have them, it's a engineering shop job...

[Big_Adam]

Ello,

I'm reading your thing and it says you've got a 998 eninge (I got no idea about valve size to engine size). If your using a stock 998 head then you'd be better off de-shrouding the valves than putting in bigger ones.

[nomininolife]

Hi Adam

Its a 12G295.


David

[Big_Adam]

Ah,

never mind then.