427 runs too hot

[bobcowan]

Originally Posted by jojoegen

I have a shell valley cobra.I have read everything I could and this radical 427 Pond iron block with edelbrock heads,560hp will run too hot at idle.Go figure.Tested engine heat with heat gun.does not show overheating so tested guage and sending unit with another and it is running hot.Checked lower rad. hose for collapsing and it,s good.It has a Kirkham expansion tank.Timing is 36 all in.Fan has no shrowd.16" puller fan works great.

This is an issue. If it runs hot at idle and not while moving, that tells you there's not enough air flow to keep the fluid cool.

A shroud allows the fan to draw air through the entire core. Without a shroud, the air is only pulled through directly beneath fan. So probably only about 60% of the core is being used.