I think youll find that 90% of all Alloy headed Falcons the gasket will blow between 100k-150k kms. 5% will be before, and the other 5% after.
My ED had it replaced at 120k kms
Unfortuanatly its not just one thing that causes it, overheating, corrosion of the gasket, not the highest quality alloy, broken/stretched head bolts, the fact that alloy and cast iron heat and cool at different rates, all contribute to it......
1993 ED XR6 M5 (1 of 329)
Turbo on the way!!
1993 EBII Fairmont (Now wrecking, PM if you want any parts)
1988 Nissan R31 Skyline