Quote Originally Posted by Hammink Performance View Post
The billet aluminum hose plugs Mike Forte was talking about do actually work really nice. Ofcourse they are more expensive than rubber caps, but they seem worth the risk to me!
Attachment 9790
The Ford Racing Tech I spoke with this week said you need to bridge the heater input/output even if you don't use a heater for proper head cooling flow. If you block the heater, the rearward drivers side cylinder will be starved for coolant or so I was told.

I believe the DOHC 4.6L had cooling issues with the rearward cylinders as well.