thermostat postion

[felskee]

well that is a possibility. cause were redoing the intake gasket today and replacing the radiator from a 1 core to 2. only cause the original has cracks in the plastic.

 

[retorq]

What heads did you put on?? 260 on the gauge is dangerous seeing as how that gauge is reading head temp on the drivers side head, that is usually the cooler of the two.

 

[felskee]

http://www.oreillyauto.com/site/c/detail/PTQ0/2CH4.oap?pt=02257&ppt=C0332#

 

[retorq]

Seems to be a Vortec head, you using a Vortec (96++) block??

 

[felskee]

yepp its a 99 5.7

 

[retorq]

It really sounds like a Vortec bypass issue ... did you hook up all the coolant lines?? The one form the front of the intake to the pump is important on those ...