They are an 85 cylinder head. The first roller H.O. motor was in 1985, but it was carbed. As far as the 85's and 87's being identical i'm not sure. I know the 86 heads are the ones to stay away from.
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Good luck!
Brad R.
1992 L.X. 5.0 coupe
MODS: A few little bolt ons 
New Best time ...11.60 @ 128 mph @ 2000+ ft altitude.
Rice Haters Club member #39
Users rides #2542
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