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These are 65mm units, but 70mm examples are available and come recommended if you go as far as tweaking the intake, cam, and heads (a stroker kit would also force the necessity, too). When you install them, remember that there is a left and a right, and you need to remove the throttle position sensor (TPS) from the originals and install it on the new versions. Timing the shafts can be tricky, so call Hennessey (like we did) if you have issues. As if you own a Viper!