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bullet ground the cam for me.my engine builder set the heads up for me.the car pops something terribel on spray.i called bullet friday and they said 280-320 spring pressure on the seat.i checked this morning and found 200-225 would this cause popping and back firering. on nos
 

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if you're floating valves due to inadequate spring pressure, then it would cause it to pop. why are your springs so light? were they initially in the 280-320 lbs range?
 
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