IDIBRONCO
IDIBRONCO
Technical question about a head. Background: a few months ago, I bought a 85 F250 with a 6.9 in it. I actually installed the engine in 1998 in the shop I used to work at. The engine was remanufactured by us. The machine shop we used didn't take any more material off of the heads than was necessary to ensure that they were flat. I had a head gasket go out in it after a couple of months of driving. The fire ring on the back cylinder on the passenger's side came apart. This isn't about why that happened. On the bottom side of the head, where the fire ring came apart, there is a groove that is .009" deep. I measured using my Starrett depth mic so I'm sure about the depth. My question is this, can I have the head surfaced and still have enough valve clearance? I know that the pistons protrude a few thousandths above the deck of the block and that's why I'm asking for opinions. I have no idea how much material might have been removed in 1998 by the machine shop. Just looking for opinions.