Well boys and girls, today's lesson is the proper use of a 351 intake manifold gasket. As seen in the photo snagged from
Fordification.com, the 351w had 2 different intakes. One with 16 bolts and those after 1977 12. In the Polaroids below, it is unwise to mix and match gaskets due to corrosion and the overwhelming possibility of turning your crank case into a delicious looking milk shake. Note the marvelous examples of corrosion that bolts 13, 14, 15, and 16 were exposed to, and lets not forget to honor the wounded threads.
I do believe this is why there was water in the oil.
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| L Shaped water port, Square shaped gasket. |
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| Guess which intake bolt didn't have water exposure. |
If you are installing early 351W heads on a 289, 302 or 5.0 engine, take note of the water port differences and gasket requirements. You MUST use the correct 351W gaskets on the early heads or you will get four major water leaks! The early 351W intakes had 4 extra bolts that went through the 4 water jackets. You MUST use a 351W head gasket on early 351W heads that have the "L" shaped water ports
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| Wrong #1 |
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| Wrong #2 |
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| Correct! |
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