84-86 have the E6 casting heads, 87-93 have E7's....theres a difference, and they dont flow the same as far as i know...the E7's are still ****** heads though
my 87 mustang made 236hp/286tq (246/302 uncorrected) with the explorer intake, 1.7 rockers, shorties, off road X, and dumped flowmasters...also bumped timing and a/c delete. stock heads/cam
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Matt

B18B1 FTW
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