This brand new partial engine includes the forged reciprocating components, as well as the balancer, oil pan and timing chain set. Just add GMPP or your custom cylinder heads, intake, carburetor and ignition system to complete. This partial engine comes with camshaft P/N 809-12366543, but must be changed to camshaft P/N 809-12552296 to match HT502 specifications. Use externally balanced flywheel or flexplate.