Stepping up from the ZL13, this extremely aggressive 236/241 duration cam with a very choppy idle, needs a large displacement high compression custom built engine.  While still streetable, this cam is intended for an all out race engine featuring a .600"/.565" reverse split lift for heads with with extreme hi-flow exhaust ports.  Has an effective power band from 2800 to 6800 rpm.  Hardened pushrods and 6.vsp515 valve springs required.