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Top Fuel tends to leave oil gunk on the engines. I have a fair amount on my Piston. Does this need to be cleaned off, and if so, what is the best way to clean it up without scratching anything?

Can I just replace the crankcase or do I have to replace the whole thing? Because if I have to replace the piston and sleeve as well than I'd rather not, because at that point I'd rather just get a...

The hole for one of the engine cooling head screws in my 3.3 is stripped, and it causes a massive air leak. Is there anything I can do or do I have to replace the entire engine from one screw? I...