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I think that's a head shim? I'm not sure what it is exactly.

This engine manual says that I need 20-30% nitro fuel for this engine would anything bad happen if I just run on 15% that I have? I've already ran it off the fuel and it seems fine. I think it's got a higher oil % though and I'll need to try and tune it up right....

Should I get High temp copper RTV gasket maker material for the engine and carb to seal the air leaks? That's what the engine tuning thread recommend doing I'll post a link to it. https://www.rctalk.com/forum/threads/nitro-tuning-tips-and-tuning-flow-chart.60832/#post-726317 Check post #5

Can I replace the o-rings or are they engine specific? I'll check em this weekend if I get a chance!

I've gotten it to start and run up to operating temp. How would you fix that?

This is the first (nitro) RC truck or (nitro) land vehicle that I've owned so any advice or suggestions are appreciated! @cbaker65 & @STONER RC might need your help with tuning. I have gotten the engine loosened and unstuck! Here's what's happened so far. Header before polishing with a Dremel...