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Looking to replace the ancient plugs in my Commando, and I realized that none of the replacement charts show a unique plug for the Commando. They just show the same plug for every small block. The FSM shows N10Y for the 273-4, N9Y for the 340, and N14Y for everything else — this makes me think...

I bought a new Clowes double-roller timing set for my 273 Commando. It has three key positions, so you can install the cam advanced, at zero, or retarded. I understand that advancing the cam makes more low end torque, and retarding it makes more peak power. My question is, how much would the...