Oh one other think if you fancy the idea how about twin side drought webbers or if the injection option ith throttle body's

I have been considering this myself but don't want the expense of gas injection.

Dai

Well the comsuption is not that important. The car is not used to daily driver... And it's not consuming that much...

And what about the idea of changing the head?

The head will be a machine shop job to get the porting and valves done. Would be worth it.

Your best bet is to talk it through with them as they will have to do the work.

Dai

The other parts of the motour won't fail down caused by the increase of the compression ratio (9.5 to 10.5)?

i dont think youll break anything , these are pretty hardy motors !!

I was going to raise the compression in my old B20f as I run very high octane fuel. Unfortunatle the engine suffered some water damage.

Dai