Posted by Jerry Dunaway on Wednesday, December 03, 2003 at 10:25PM :
In Reply to: Re: 251 Head Gasket Replacement posted by Roger Iida on Monday, December 01, 2003 at 7:38PM :
The hump is directly in front of the #1 spark plug on the front side of the head. I think most if not all 251's have it.
Jerry