FWIW, I personally never use silicone hose for anything because it unzips itself under pressure if nicked even slightly. Instead I used 1-1/2" OD sweat-solder 90 degree copper fittings from a plumbing supply shop, with short straight pieces of 1-3/8" Gates Green Stripe rad hose (heated in hot water to expand them a bit), to connect into & out of the rad and go around my Flexilite dual sucker-fan shroud.
I also used such a big copper fitting on the end of the underbody water transfer tube back where one comes close to the front of the engine & over to the header tank. No leaks in this century.