
Either 3.9 or 4.6 configuration.
Phantom cylinder heads have substantially increased port sizes but standard size valves. The exact specification for these heads can be found in the Head Porting section of this website, but specifications include:
V8 Developments Ltd.,
Cobwebbs Farm,
Swale Bank,
Gosberton Westhorpe,
Spalding,
Lincolnshire,
PE11 4LG
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