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You can drop in stock bore 13 to 1 pistons . No problem . Even the 35 deg ignition timming will be good with 93 octane fuel. I am running better rods because of the nitrous. As for springs. The stock valves and springs are good.But with bigger valves I want stronger springs to control the valves. I expect to push the power band up to 14000 rpm.If the valves hit or the spring breakes it is all over.
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