well there's a couple things that can happen with a head gasket you can blow it between cylindars, you can blow it from a water jacket towards the cylindar or you can blow from a water jacket out the side of the head.
My girlfriends 4 cyl dodge shadow blew out the side , so it woudl leak coolant all over, but it ran fine and didnt even smoke.
so the cranking method MAYNOT show a head gasket problem if you're not getting compression into the coolant...
but if you are... when your piston comes up, it'll compress that air, it'll want to come out anywhere it can.. and if the gasket is blown out, it'll leak out that hole and get into the coolant system and it will displace coolant... the coolant will only have one place to go ... out your rad cap.
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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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