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87 was the change over year. The motors switched to roller lifters, centerbolt valve covers, and remote coil distributors.
86 was the changed over from 2 piece to 1 piece RMS but I'm not positive on that.
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2001 Trans Am WS6 •SLP Loudmouth II •UMI Suspension •12.857 @ 109.57
1996 Trans Am WS6 •Pacesetter Longtubes •Strange 12 Bolt •Spohn Suspension •11.152 @ 123.85
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