5.0L / 304 cylinder heads

[alloytech32]

I have a set of brand new cylinder heads which I had as spares for a race car but never ended up using them. Does anyone know how to tell if they are genuine holden heads or after market?

[alloytech32]

wondering if anyone knows more about this?

[ScoHar]

I have a set of brand new cylinder heads which I had as spares for a race car but never ended up using them. Does anyone know how to tell if they are genuine holden heads or after market?

Gonna sound stupid, but are they cast iron ones? or Alloy ones? Cos if Alloy then 100% after market, but your prob already know that.