Overheating 360 new engine

Dave_J said

A 17" tall by 25" wide radiator is 425 Sq Inch. 50% is 212.5 Sq Inch.

A factory 17 inch fan shroud opening is 227 Sq Inch so a little less than 50% blocked.

The two 12 inch electric fans are about 226.19 Sq Inch so still a bit less than 50%

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The difference is the stock fan shroud is not an inch away from the back of the radiator. And I know people will dismiss what I'm about to say but at road speeds the air will be stagnant in the areas where the aluminum shroud is parallel to the rad core.

Would you rather spray a stream of water into a funnel or at a flat.

At the flat the water (or air) has to turn 90 deg on impact, much will just bounce back. Like dropping a ball on the ground. It goes back up not sideways.

A good shroud will have a funnel shape of some type and be spaced farther away from the core, also if it is flat like your is it will have rubber flappers that open at speed and close at idle.

I'm out!