This kit has everything you need to start a poorly designed 4.3 liter Vortec engine. If you are thinking about buying one, you already know the disadvantages of the motor, so I won't go into detail about them. This kit is the same as the Delco kit except you do NOT get instructions! You will need a GM Technical Service Bulletin for installation. This will eliminate your timing chain slack as all "4.3 balancer shafts" have the camshaft bore and BS holes too deep in the block. Even a brand newβ¦