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I posted this in the other video's thread but think it's worth it's own topic, purely because the amount of ground it covers. Some of you may have read vizards book, whilst this concerns the A series engine, it references topics we regularly discuss in the modified engine section up to and including. He generally explains things pretty simply, and if you want to understand a bit more about a number of topics including those below, watch it. Filtration Fuel atomisation Compression ratios Dynamic compression ratios Brake Specific fuel consumption Porting Valve design Valve seat design including 3 angle valve modification Lifter / bucket diameter Roller rocker design and limitations Ramp angles on camshafts Cam shaft timing Carbs vs injection (lucas mechanical) Valve shrouding Bigger vs more valves Decking blocks Squish height Burn time Rod lengh / ratio Octane ratings Water injection and some more that i can't remember Cheers J