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so right now i have a 1986 thunderbird 5.0 non HO with the seed density, and i'm gona replace it with a 5.0 HO and a 5 speed next summer. but i ported and gasket matched a set of E7 heads in my class a little while back and i just wanted to know, if i bolt on these heads, will the MAF style computer start having any sort of reading errors? i wouldn't think so but i just wanna make sure.
I don't think that there will be any problems with the mass air system with the E7 heads. You will have a huge problem unless you change the pistons, though. The 1986 (E6) engine used a one year only set of heads. The E6 heads didn't require notches or valve reliefs to be cut into the tops of the pistons. These pistons have a completely flat surface. A set of pistons with valve reliefs must be used.
All of the H.O. pistons from 1987 up to the end of production, have the valve reliefs and a 9.0:1 compression ratio. All H.O. engines from 87 thru 92 use factory forged pistons. In 1993 the factory pistons were downgraded to the cheaper Hypereutectic aluminum.