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how many thousands is the shim and what will your squish and compression ratio be. What you are doing with the shim is your raising your port timming which will give you more top end but you will have to bump up your rpm's or it wont help much,as far as the shaved head this will give you torque,be careful not to go above 13-1 for your comp ratio or you will have to run 93 or better octane. Let us know how it runs. happy sleddin.
 
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