This is how we ship the kit to you; the alternator, fan, ring and idler pulley are fully assembled for your convenience.
The NO heater shrouds come in 3 different widths to accomodate engines that have been built with stock length rods 5.4" or engines with 5.5"-5.6" rods and 5.7" rod lengths . If you are not sure as to what rod lengths you have in your engines, simply measure the width of your engine from the center top head exhaust stud to the other side's center top head exhaust stud. For a stock length rod engine it should be approximately 20". Engines with 5.5" or 5.6" rod lengths will measure out 20.5" and engines with 5.7" length rods the engine width will be 21".