Side oiler was a variation on the 427, not sure if the tunnel ports were or not... Maybe G will be along and tell us both! I've seen the tunnel port heads show up occasionally on eBay, they get really spendy!!! The ports were huge and flowed great! Having either a cammer or a tunnel-port would definitely have to be my dream engine!!!! If I could ever find and afford one, think I'd have to buy me one of those "brand new" '67 Fastback shells those guys in Az. build and build me one awesome Horse!!!!