Engine overheating, Jacuzzi jet drive; help?

[willawalla]

We just bought a used boat, came with a Jacuzzi jet drive and a rebuilt V8 Oldsmobile engine. The engine easily overheats...and ideas what the problem could be? Is the Jacuzzi a good brand?
Thanks

 

[JUSTINTIME]

Re: Engine overheating, Jacuzzi jet drive; help?

u need to back flush