i bought a 89crown vic from a guy that has e7te stamped on the block that is equipped with roller lifters 302 firing order, forged small dish 0 valve relief pistons, and efi system. the original factory heads were '86 stamping that are heart shaped combustion chambers which aka quenched, or closed for higher compression, which is only meant for a raised compression ratio over the 87 heads which were bigger chambered, and also this bigger chamber created lower compression and in all reality equals less power.BUT the 87s had bigger exhaust runners with big chambers thats good for blower or turbo i think the small combustion chamber with smaller exhaust runners in the quenched chambered heads made for better torque specs. the e7s were more for horsepower i would guess