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Lucky 7 is the nitro engine sealant of tomorrow. I've been using it for 2 years on my engines and I haven't had any air leak issues since. You just have to make sure your engine is nice and clean. I leave the backplate bolts hand tight while applying the sealer, then I immediately tighten them afterwords.
The rtv does work, but nitro can eat into it and it always makes a mess!