the harmonic balancer bolt is 15/16 I think.... as for the TDC... you can use a combination of your finger or even just a flash light to LOOK iin there... if you pull the valve cover you'll be able to just see the valve if it's open or closed and that willl give you an idea if you're on compression stroke or not... the balancer only goes on ONE way, so you'll know if your at TDC with that... then it's just a matter of which stroke...
-as
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'89 GT Convertible:
TFS TW Heads, TFS Street Intake, TFS Stage 1 Cam, FMS 1.6 RRs, 24# Injectors, Pro-M 75mm MAF, No Name CAI, 3.73s, O/R H-Pipe, FlowMasters, AOD w/ Trans-Go Shift Kit
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