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I had a Mr.Gasket block off plate that leaked like crazy. Changed to a Spectre Performance 42473 and never had an issue. Sealed with the rightstuff, and I used a bunch of washers on my old bolts as the ones it came with seemed too short and I was worried I was gonna drop one inside.
IIRC, you use a BBC plate and may need to grind one corner a little bit to make it sit flat. I used a gasket as a template to make one from some plate aluminum I had laying around.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.