[dailydragger03]

Gen 3 chevrolet motors do not have coolant passages in the intake manifold. It is impossible for antifreeze to ruin the gaskets or the manifold because neither ever come in contact with coolant. This was a common issue on the 4.3 and 5.7 vortec motors in the late 90's. Dexcool is a horrible product and if your vehicle has it you should flush it out and use regular ethylene glycol antifreeze. Dexcool has been known to eat gaskets and pit metal. I had to replace water pump gaskets on my 5.3 T code at 40k miles. This is when I flushed out the dexcool and replaced it with regular antifreeze and a pint of rust inhibitor. The gen 3 motors are extremely solid I have heard of very little problems other than dexcool. Tune them up at about 100k miles and drive the wheels off of em.