US 200 I6 heads prone to warp?


Well-known member
A buddy said he had an '81 Mustang with the I6 which had head warping problems. He had the head milled several times but it still warped. I've noticed the I6 '65 Mustang I just bought was leaking between head and block while I was checking it over.

Is head warping really that prevalent? My first 200 I6 never had any warpage problems and I ran the snot out of that car.


Dean T
The heads need to be torqued in a very specific sequence, but they are not prone to excessive warping.

The blocks, however, tend to "shrink" in certain dimensions as they go thru several heating/cooling cycles. In order to get a good seal and prevent weeping on the left side, you have to have the block decked.