Robin
This was early smog control. Ford used the thermactor emission
control system or T/E. An air pump was used to pump air into each exhaust
port. Later heads have an internal passage for the air.
Ron Fraser
Thank you Ron; Is it then advisable to remove the lob from the heads when
the heads are machined. I added the hardened seats, screw in studs and
completely ported the heads. Was removing the lob the right thing to do for
efficiency and power? RObin
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