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When installing new intake gaskets, it is imperative that the intake manifold gasket surfaces are perfectly plane with one another or the gaskets will get sucked in again in less than 10k miles! This can happen if the intake nuts were retightened repeatedly in an attempt to cure the leaks. Take the manifolds and check the gasket surface against an absolutely flat surface, such as a granite slab, or a polished piece of marble or porcelain tile. If not flat, you can take it to a machinist to have them plane them, or you can attempt to sand them flat with sandpaper taped to a granite countertop. The phenolic spacers should also not be warped, and it is also important that they still have the concentric grooves molded on both sides to grip the gasket. If they are barely there, or scraped off when trying to remove the old gasket, replace them with new ones. I use a dark brown sticky Permatex aviation gasket sealer on all gasket sides for additional insurance. Be sure to torque the manifold nuts with a torque wrench to the exact specification of 16-18 ft-lbs (IIRC) not any more or less. Come back after driving it a few thousand miles, check and retorque again if necessary, because the gaskets will have shrunk and settled in.
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