I need a head job

[GRUNTMAX]

Bruce is correct, I reckon, as stuff all cc increase.
Stainless Stock Size Valves / Ferea
Carpenter Valve Springs
APE Retainers, Valve Guides & Seals
Porting

But like Bruce says, a hell of a lot of strain & sudden load on the stock conrods when you bung a bit of nitrous in.
Crower Conrods from NLR Systems

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Oh, if it is a Gen2 Head, you'll probably be right with ya stock titanium valves