Are you talking about ported 516's?
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Are You CERTAIN these are 2.14 1.88?Those combos CANT work in stock location.Max Wedge were 2.08 1.88....The 1.74 WILL work good for increasing torque on heavy vehicles.I have a set of 516's that out flow the 915s I ever had.Or Any Other STOCK Chrysler head(On a Vehicle including MW...).


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T & K Performance