Kid,
I fitted the 4V 228cc CHI heads to my car.
The Intake ports are actually 3V & flare up to suit the 4V manifold.
The exhaust ports are 3V which means no header matching required.
CHI can supply the heads to suit either the original dome top pistons or aftermarket flat tops.
Compression is 11:1 so you will need good fuel.
We have 98 octane at the pump at all gas stations so its not really an issue here in Australia, I would imagine its similar in Europe.
(Although a little Tolulene & Acetone in the brew would not hurt).
regards,
Tony.
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