21 Stud heads..different?

Talkwrench

Talkwrench

Well-known member
Just started to prep the heads for my build and after I sandblasted them there seems to be quite a difference. One for sure is a 77E notice that casting seems much finer and the piston area a little larger . The other is quite a porous even has a hard edge on one or two of the piston areas and tighter .. Whats the go, mis-matched? I take that 37 blocks would have the 77E on both sides [my other engine does] . Nothing to do with the valve transfer areas being slightly different as they are in the block one side is deeper than the other?
 

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Hi Rob , The head on the left is a 77E with firing order cast on top .( English Ford Pilot , many of these were shipped to the US as replacements for the 37- 38 21 stud engines ) the one on the right looks like USA / Canadian 37 - 38
 
I'm going to to and see a mate this morning and I'm sure I'll find another 77E. I'll be machining them down anyway.
 
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