just bumps the compression up....no cam yet,no throttle body, no intake...right now just workin on the essentials, the engine and fuel delivery.....what happens is with the longer rod ratio...it keeps the piston at the top to dwell a bit longer if i am correct making the combustion cycle burn more of the fuel completely..if i am correct as well...theoretically this should help with emissions as long as the fuel mixture is right as well