Discuss cylinder heads and MAF on AllFordMustangs.com, the place for Mustang enthusiasts.
Welcome to our Mustang forums where Mustangers come together to hang out, discuss and enjoy their favorite Mustang hobby with fellow Mustang enthusiasts. We invite everyone to read, post, and enjoy our Mustang forum as well as the many other sections of our site.
You are currently viewing our forums as a guest. By joining our community you gain access to post topics, communicate with members, upload your photos and access many other special features. Registration is fast, simple and free so why wait, join our Mustang community today! If you have any problems with registration or your account login, please contact support.
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.
cylinder heads and MAF 
