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The timing I was talking about was for the camshaft, not ignition. When you change the CAM timing, you're changing the relationship between the cam and the crank. The aftermarket 'hotrod' roller chain sets have three keyways in the crank sprocket. One will advance the cam actuation 4 degrees from stock, one will set it at the stock position (0 degrees or 'straight up') & the third one will retard the cam timing 4 degrees. You choose which one depending on your desired performance. In general, advancing the cam timing event builds low end torque at the expense of some high RPM horsepower. In an RV, you want all the torque you can get, and you never even get to any RPM that could be considered high. It's a total win situation. The only reason the factory didn't do it was to meet certain emission certification requirements. Funny thing is, my 440 runs cleaner now than it did stock. |
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