Re: Water in Oil 406 cu in
You need to re-torque the heads after a few heat cycles. Aluminum and iron expand at different rates... Also, I've noticed I have to go over ALOT of my intake and especially valve cover bolts because the engine shakes and vibrates so much... Another problem area is main bolts that go into the water jacket. 400's usually crack at the main webbings, especially on 4 bolts, and the mains as well.
FWIW my stock truck vortec L-31 leaked water like a siv because all of the intake bolts were hand tight, it just goes to show the cam doesn't have to be radical engine to back bolts out.
The only Mustang I'd ever own is a Fender.
'68 333" Camaro
'14 5.0 Mustang