Bought a used 604 that was a winning motor. I finally got the car free enough to get the bog out of it but it doesnt seem to like turn over 6000 when in racing conditions. It runs fine and is very responsive and plugs look good. Would the valve springs have fallen off that much to cause this? One track i run everyone else is running a 5;95 gear and im running a 6:25 with the same tire combo.
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