I happened to me on the top end to with some 9 inch slicks with around 10-11 psi in them. I was told at the time by the old timers at the track that slicks will do that when they get old and start to deteriorate.
It must be true, because I have run plenty of times with 10 psi in my ET Streets and never had any top end sway at all.
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1988 Mustang GT
stock bottom 302, C4
10.9 @ 128 with 8 psi of Novi 1000 boost!----STOLEN
1989 Mustang notchback
Warmed up 306 with a Procharger.
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