With the cancellation of the Phase4, Ford still wanted to be able to use the winged sump in their race cars, but had to prove it was a factory part, so they fitted them to production cars. This fitment appears to have been a bit hit and miss, as popular speculation says they were not just fitted to GT’s, but also to ordinary 351-equipped Falcons, and even F100 pickups. What can be stated as fact is that the winged sump was not part of the RPO83 option, as fitted to late - August/September, 1973 - XA GT’s.
Here is the original ‘4 dot’ headed, square block, CK617 engine being removed from an RPO83 car.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgAXo_mcQU7MazQUc2MH0kXdgk9Q_5LaJgdPQDgdZua7lPCrIKm_hTmuNiAI1GvzwLAg1PRrs68ZOW9vw-HUj7Lvfd9QyCiAF2fPGwYqrklQIF0Ml6Mtrq3IhH9QcULxa8T8cAcCw/s320/RedRPO41.jpg)
No wings.
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