Thanks for the help. I plan on buying a caddy either with the 4.9 or the 4.6 northstar motor. Please help, I need to know which is the better motor for durability and reliability. Please bear in mind that which ever caddy I decide to buy will be setting for smetimes 2wks without being started. I know that the STS needs to be driven hard and often so which motor will best suit my needs? I am somewhat leery of the 4.6 motor in that the block is bolted together.