No blown plugs on this engine ever!

I clean the air filters after every race day... I think I forgot to add filter oil the last time!

I will take some pics tonight and post them! the scratch is fairly deep looks like it might have been made by a piece of metal perhaps a little bigger that glow plow element. After putting it together I turned it with the flywheel on and it is still feels a bid tight but seems like compression is no longer there!